enough with umpteen "i18n.h" files. Consolidate on pbd/i18n.h
[ardour.git] / gtk2_ardour / editor_ops.cc
index ed1cc7b25699a0a682fc45022338cc2924583b3c..c83e96d67f15a269d77d3d561e7227c30e31d830 100644 (file)
@@ -42,6 +42,7 @@
 
 #include "ardour/audio_track.h"
 #include "ardour/audioregion.h"
+#include "ardour/boost_debug.h"
 #include "ardour/dB.h"
 #include "ardour/location.h"
 #include "ardour/midi_region.h"
 #include "ardour/playlist_factory.h"
 #include "ardour/profile.h"
 #include "ardour/quantize.h"
+#include "ardour/legatize.h"
 #include "ardour/region_factory.h"
 #include "ardour/reverse.h"
 #include "ardour/session.h"
 #include "ardour/session_playlists.h"
 #include "ardour/strip_silence.h"
 #include "ardour/transient_detector.h"
+#include "ardour/transpose.h"
 
 #include "canvas/canvas.h"
 
 #include "actions.h"
-#include "ardour_ui.h"
 #include "audio_region_view.h"
 #include "audio_streamview.h"
 #include "audio_time_axis.h"
@@ -75,7 +77,7 @@
 #include "editor_regions.h"
 #include "editor_routes.h"
 #include "gui_thread.h"
-#include "insert_time_dialog.h"
+#include "insert_remove_time_dialog.h"
 #include "interthread_progress_window.h"
 #include "item_counts.h"
 #include "keyboard.h"
@@ -83,6 +85,8 @@
 #include "mixer_strip.h"
 #include "mouse_cursors.h"
 #include "normalize_dialog.h"
+#include "note.h"
+#include "paste_context.h"
 #include "patch_change_dialog.h"
 #include "quantize_dialog.h"
 #include "region_gain_line.h"
 #include "streamview.h"
 #include "strip_silence_dialog.h"
 #include "time_axis_view.h"
+#include "timers.h"
 #include "transpose_dialog.h"
+#include "transform_dialog.h"
+#include "ui_config.h"
 
-#include "i18n.h"
+#include "pbd/i18n.h"
 
 using namespace std;
 using namespace ARDOUR;
@@ -115,9 +122,14 @@ Editor::undo (uint32_t n)
        if (_drags->active ()) {
                _drags->abort ();
        }
-       
+
        if (_session) {
                _session->undo (n);
+               if (_session->undo_depth() == 0) {
+                       undo_action->set_sensitive(false);
+               }
+               redo_action->set_sensitive(true);
+               begin_selection_op_history ();
        }
 }
 
@@ -127,14 +139,19 @@ Editor::redo (uint32_t n)
        if (_drags->active ()) {
                _drags->abort ();
        }
-       
+
        if (_session) {
                _session->redo (n);
+               if (_session->redo_depth() == 0) {
+                       redo_action->set_sensitive(false);
+               }
+               undo_action->set_sensitive(true);
+               begin_selection_op_history ();
        }
 }
 
 void
-Editor::split_regions_at (framepos_t where, RegionSelection& regions)
+Editor::split_regions_at (framepos_t where, RegionSelection& regions, const int32_t sub_num)
 {
        bool frozen = false;
 
@@ -209,20 +226,20 @@ Editor::split_regions_at (framepos_t where, RegionSelection& regions)
 
                if (pl) {
                        pl->clear_changes ();
-                       pl->split_region ((*a)->region(), where);
+                       pl->split_region ((*a)->region(), where, sub_num);
                        _session->add_command (new StatefulDiffCommand (pl));
                }
 
                a = tmp;
        }
 
+       latest_regionviews.clear ();
+
        vector<sigc::connection> region_added_connections;
 
        for (list<RouteTimeAxisView*>::iterator i = used_trackviews.begin(); i != used_trackviews.end(); ++i) {
                region_added_connections.push_back ((*i)->view()->RegionViewAdded.connect (sigc::mem_fun(*this, &Editor::collect_new_region_view)));
        }
-       
-       latest_regionviews.clear ();
 
        while (used_playlists.size() > 0) {
                list <boost::shared_ptr<Playlist > >::iterator i = used_playlists.begin();
@@ -233,22 +250,51 @@ Editor::split_regions_at (framepos_t where, RegionSelection& regions)
        for (vector<sigc::connection>::iterator c = region_added_connections.begin(); c != region_added_connections.end(); ++c) {
                (*c).disconnect ();
        }
-       
-       commit_reversible_command ();
 
        if (frozen){
                EditorThaw(); /* Emit Signal */
        }
 
-       if (ARDOUR::Profile->get_mixbus()) {
-               //IFF we were working on selected regions, try to reinstate the other region selections that existed before the freeze/thaw.
-               _ignore_follow_edits = true;  //a split will change the region selection in mysterious ways;  its not practical or wanted to follow this edit
-               if( working_on_selection ) {
+       if (working_on_selection) {
+               // IFF we were working on selected regions, try to reinstate the other region selections that existed before the freeze/thaw.
+
+               _ignore_follow_edits = true;  // a split will change the region selection in mysterious ways;  it's not practical or wanted to follow this edit
+               RegionSelectionAfterSplit rsas = Config->get_region_selection_after_split();
+               /* There are three classes of regions that we might want selected after
+                  splitting selected regions:
+                   - regions selected before the split operation, and unaffected by it
+                   - newly-created regions before the split
+                   - newly-created regions after the split
+                */
+
+               if (rsas & Existing) {
+                       // region selections that existed before the split.
                        selection->add ( pre_selected_regions );
+               }
+
+               for (RegionSelection::iterator ri = latest_regionviews.begin(); ri != latest_regionviews.end(); ri++) {
+                       if ((*ri)->region()->position() < where) {
+                               // new regions created before the split
+                               if (rsas & NewlyCreatedLeft) {
+                                       selection->add (*ri);
+                               }
+                       } else {
+                               // new regions created after the split
+                               if (rsas & NewlyCreatedRight) {
+                                       selection->add (*ri);
+                               }
+                       }
+               }
+               _ignore_follow_edits = false;
+       } else {
+               _ignore_follow_edits = true;
+               if( working_on_selection ) {
                        selection->add (latest_regionviews);  //these are the new regions created after the split
                }
                _ignore_follow_edits = false;
        }
+
+       commit_reversible_command ();
 }
 
 /** Move one extreme of the current range selection.  If more than one range is selected,
@@ -293,9 +339,9 @@ Editor::move_range_selection_start_or_end_to_region_boundary (bool move_end, boo
                return;
        }
 
-       begin_reversible_command (_("alter selection"));
+       begin_reversible_selection_op (_("alter selection"));
        selection->set_preserving_all_ranges (start, end);
-       commit_reversible_command ();
+       commit_reversible_selection_op ();
 }
 
 bool
@@ -357,8 +403,7 @@ Editor::nudge_forward (bool next, bool force_playhead)
        } else if (!force_playhead && !selection->markers.empty()) {
 
                bool is_start;
-
-               begin_reversible_command (_("nudge location forward"));
+               bool in_command = false;
 
                for (MarkerSelection::iterator i = selection->markers.begin(); i != selection->markers.end(); ++i) {
 
@@ -388,14 +433,22 @@ Editor::nudge_forward (bool next, bool force_playhead)
                                        } else {
                                                loc->set_end (max_framepos);
                                        }
+                                       if (loc->is_session_range()) {
+                                               _session->set_end_is_free (false);
+                                       }
+                               }
+                               if (!in_command) {
+                                       begin_reversible_command (_("nudge location forward"));
+                                       in_command = true;
                                }
                                XMLNode& after (loc->get_state());
                                _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
                        }
                }
 
-               commit_reversible_command ();
-
+               if (in_command) {
+                       commit_reversible_command ();
+               }
        } else {
                distance = get_nudge_distance (playhead_cursor->current_frame (), next_distance);
                _session->request_locate (playhead_cursor->current_frame () + distance);
@@ -442,8 +495,7 @@ Editor::nudge_backward (bool next, bool force_playhead)
        } else if (!force_playhead && !selection->markers.empty()) {
 
                bool is_start;
-
-               begin_reversible_command (_("nudge location forward"));
+               bool in_command = false;
 
                for (MarkerSelection::iterator i = selection->markers.begin(); i != selection->markers.end(); ++i) {
 
@@ -475,14 +527,21 @@ Editor::nudge_backward (bool next, bool force_playhead)
                                        } else {
                                                loc->set_end (loc->length());
                                        }
+                                       if (loc->is_session_range()) {
+                                               _session->set_end_is_free (false);
+                                       }
+                               }
+                               if (!in_command) {
+                                       begin_reversible_command (_("nudge location forward"));
+                                       in_command = true;
                                }
-
                                XMLNode& after (loc->get_state());
                                _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
                        }
                }
-
-               commit_reversible_command ();
+               if (in_command) {
+                       commit_reversible_command ();
+               }
 
        } else {
 
@@ -572,7 +631,8 @@ Editor::sequence_regions ()
 
        if (!rs.empty()) {
 
-               begin_reversible_command (_("sequence regions"));
+               bool in_command = false;
+
                for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                        boost::shared_ptr<Region> r ((*i)->region());
 
@@ -592,15 +652,22 @@ Editor::sequence_regions ()
                                r->set_position(r_end_prev);
                        }
 
+                       if (!in_command) {
+                               begin_reversible_command (_("sequence regions"));
+                               in_command = true;
+                       }
                        _session->add_command (new StatefulDiffCommand (r));
 
                        r_end=r->position() + r->length();
 
                        iCount++;
                }
-               commit_reversible_command ();
-       } 
-} 
+
+               if (in_command) {
+                       commit_reversible_command ();
+               }
+       }
+}
 
 
 /* DISPLAY MOTION */
@@ -655,7 +722,7 @@ Editor::build_region_boundary_cache ()
 
        TimeAxisView *ontrack = 0;
        TrackViewList tlist;
-       
+
        if (!selection->tracks.empty()) {
                tlist = selection->tracks.filter_to_unique_playlists ();
        } else {
@@ -1368,10 +1435,9 @@ Editor::scroll_tracks_up_line ()
 }
 
 bool
-Editor::scroll_down_one_track ()
+Editor::scroll_down_one_track (bool skip_child_views)
 {
        TrackViewList::reverse_iterator next = track_views.rend();
-       std::pair<TimeAxisView*,double> res;
        const double top_of_trackviews = vertical_adjustment.get_value();
 
        for (TrackViewList::reverse_iterator t = track_views.rbegin(); t != track_views.rend(); ++t) {
@@ -1379,60 +1445,204 @@ Editor::scroll_down_one_track ()
                        continue;
                }
 
-
                /* If this is the upper-most visible trackview, we want to display
-                  the one above it (next)
-               */
-
-               res = (*t)->covers_y_position (top_of_trackviews);
+                * the one above it (next)
+                *
+                * Note that covers_y_position() is recursive and includes child views
+                */
+               std::pair<TimeAxisView*,double> res = (*t)->covers_y_position (top_of_trackviews);
 
                if (res.first) {
+                       if (skip_child_views) {
+                               break;
+                       }
+                       /* automation lane (one level, non-recursive)
+                        *
+                        * - if no automation lane exists -> move to next tack
+                        * - if the first (here: bottom-most) matches -> move to next tack
+                        * - if no y-axis match is found -> the current track is at the top
+                        *     -> move to last (here: top-most) automation lane
+                        */
+                       TimeAxisView::Children kids = (*t)->get_child_list();
+                       TimeAxisView::Children::reverse_iterator nkid = kids.rend();
+
+                       for (TimeAxisView::Children::reverse_iterator ci = kids.rbegin(); ci != kids.rend(); ++ci) {
+                               if ((*ci)->hidden()) {
+                                       continue;
+                               }
+
+                               std::pair<TimeAxisView*,double> dev;
+                               dev = (*ci)->covers_y_position (top_of_trackviews);
+                               if (dev.first) {
+                                       /* some automation lane is currently at the top */
+                                       if (ci == kids.rbegin()) {
+                                               /* first (bottom-most) autmation lane is at the top.
+                                                * -> move to next track
+                                                */
+                                               nkid = kids.rend();
+                                       }
+                                       break;
+                               }
+                               nkid = ci;
+                       }
+
+                       if (nkid != kids.rend()) {
+                               ensure_time_axis_view_is_visible (**nkid, true);
+                               return true;
+                       }
                        break;
                }
                next = t;
        }
 
        /* move to the track below the first one that covers the */
-       
+
        if (next != track_views.rend()) {
                ensure_time_axis_view_is_visible (**next, true);
                return true;
        }
 
        return false;
-}      
+}
 
 bool
-Editor::scroll_up_one_track ()
+Editor::scroll_up_one_track (bool skip_child_views)
 {
        TrackViewList::iterator prev = track_views.end();
-       std::pair<TimeAxisView*,double> res;
        double top_of_trackviews = vertical_adjustment.get_value ();
-       
+
        for (TrackViewList::iterator t = track_views.begin(); t != track_views.end(); ++t) {
 
                if ((*t)->hidden()) {
                        continue;
                }
 
-               /* find the trackview at the top of the trackview group */
-               res = (*t)->covers_y_position (top_of_trackviews);
-               
+               /* find the trackview at the top of the trackview group
+                *
+                * Note that covers_y_position() is recursive and includes child views
+                */
+               std::pair<TimeAxisView*,double> res = (*t)->covers_y_position (top_of_trackviews);
+
                if (res.first) {
+                       if (skip_child_views) {
+                               break;
+                       }
+                       /* automation lane (one level, non-recursive)
+                        *
+                        * - if no automation lane exists -> move to prev tack
+                        * - if no y-axis match is found -> the current track is at the top -> move to prev track
+                        *     (actually last automation lane of previous track, see below)
+                        * - if first (top-most) lane is at the top -> move to this track
+                        * - else move up one lane
+                        */
+                       TimeAxisView::Children kids = (*t)->get_child_list();
+                       TimeAxisView::Children::iterator pkid = kids.end();
+
+                       for (TimeAxisView::Children::iterator ci = kids.begin(); ci != kids.end(); ++ci) {
+                               if ((*ci)->hidden()) {
+                                       continue;
+                               }
+
+                               std::pair<TimeAxisView*,double> dev;
+                               dev = (*ci)->covers_y_position (top_of_trackviews);
+                               if (dev.first) {
+                                       /* some automation lane is currently at the top */
+                                       if (ci == kids.begin()) {
+                                               /* first (top-most) autmation lane is at the top.
+                                                * jump directly to this track's top
+                                                */
+                                               ensure_time_axis_view_is_visible (**t, true);
+                                               return true;
+                                       }
+                                       else if (pkid != kids.end()) {
+                                               /* some other automation lane is at the top.
+                                                * move up to prev automation lane.
+                                                */
+                                               ensure_time_axis_view_is_visible (**pkid, true);
+                                               return true;
+                                       }
+                                       assert(0); // not reached
+                                       break;
+                               }
+                               pkid = ci;
+                       }
                        break;
                }
 
                prev = t;
        }
-       
+
        if (prev != track_views.end()) {
-               ensure_time_axis_view_is_visible (**prev, true);
+               // move to bottom-most automation-lane of the previous track
+               TimeAxisView::Children kids = (*prev)->get_child_list();
+               TimeAxisView::Children::reverse_iterator pkid = kids.rend();
+               if (!skip_child_views) {
+                       // find the last visible lane
+                       for (TimeAxisView::Children::reverse_iterator ci = kids.rbegin(); ci != kids.rend(); ++ci) {
+                               if (!(*ci)->hidden()) {
+                                       pkid = ci;
+                                       break;
+                               }
+                       }
+               }
+               if (pkid != kids.rend()) {
+                       ensure_time_axis_view_is_visible (**pkid, true);
+               } else  {
+                       ensure_time_axis_view_is_visible (**prev, true);
+               }
                return true;
        }
 
        return false;
 }
 
+void
+Editor::scroll_left_step ()
+{
+       framepos_t xdelta = (current_page_samples() / 8);
+
+       if (leftmost_frame > xdelta) {
+               reset_x_origin (leftmost_frame - xdelta);
+       } else {
+               reset_x_origin (0);
+       }
+}
+
+
+void
+Editor::scroll_right_step ()
+{
+       framepos_t xdelta = (current_page_samples() / 8);
+
+       if (max_framepos - xdelta > leftmost_frame) {
+               reset_x_origin (leftmost_frame + xdelta);
+       } else {
+               reset_x_origin (max_framepos - current_page_samples());
+       }
+}
+
+void
+Editor::scroll_left_half_page ()
+{
+       framepos_t xdelta = (current_page_samples() / 2);
+       if (leftmost_frame > xdelta) {
+               reset_x_origin (leftmost_frame - xdelta);
+       } else {
+               reset_x_origin (0);
+       }
+}
+
+void
+Editor::scroll_right_half_page ()
+{
+       framepos_t xdelta = (current_page_samples() / 2);
+       if (max_framepos - xdelta > leftmost_frame) {
+               reset_x_origin (leftmost_frame + xdelta);
+       } else {
+               reset_x_origin (max_framepos - current_page_samples());
+       }
+}
+
 /* ZOOM */
 
 void
@@ -1447,7 +1657,7 @@ Editor::tav_zoom_step (bool coarser)
        } else {
                ts = &selection->tracks;
        }
-       
+
        for (TrackViewList::iterator i = ts->begin(); i != ts->end(); ++i) {
                TimeAxisView *tv = (static_cast<TimeAxisView*>(*i));
                        tv->step_height (coarser);
@@ -1466,7 +1676,7 @@ Editor::tav_zoom_smooth (bool coarser, bool force_all)
        } else {
                ts = &selection->tracks;
        }
-       
+
        for (TrackViewList::iterator i = ts->begin(); i != ts->end(); ++i) {
                TimeAxisView *tv = (static_cast<TimeAxisView*>(*i));
                uint32_t h = tv->current_height ();
@@ -1484,6 +1694,14 @@ Editor::tav_zoom_smooth (bool coarser, bool force_all)
        }
 }
 
+void
+Editor::temporal_zoom_step_mouse_focus (bool coarser)
+{
+       Editing::ZoomFocus temp_focus = zoom_focus;
+       zoom_focus = Editing::ZoomFocusMouse;
+       temporal_zoom_step (coarser);
+       zoom_focus = temp_focus;
+}
 
 void
 Editor::temporal_zoom_step (bool coarser)
@@ -1524,7 +1742,7 @@ Editor::temporal_zoom (framecnt_t fpp)
                return;
        }
 
-       // Imposing an arbitrary limit to zoom out as too much zoom out produces 
+       // Imposing an arbitrary limit to zoom out as too much zoom out produces
        // segfaults for lack of memory. If somebody decides this is not high enough I
        // believe it can be raisen to higher values but some limit must be in place.
        //
@@ -1533,7 +1751,7 @@ Editor::temporal_zoom (framecnt_t fpp)
        // would be 4147200000 samples, so 2592000 samples per pixel.
 
        nfpp = min (fpp, (framecnt_t) 2592000);
-       nfpp = max ((framecnt_t) 1, fpp);
+       nfpp = max ((framecnt_t) 1, nfpp);
 
        new_page_size = (framepos_t) floor (_visible_canvas_width * nfpp);
        half_page_size = new_page_size / 2;
@@ -1669,28 +1887,8 @@ Editor::temporal_zoom_region (bool both_axes)
        framepos_t end = 0;
        set<TimeAxisView*> tracks;
 
-       RegionSelection rs = get_regions_from_selection_and_entered ();
-
-       if (rs.empty()) {
-               return;
-       }
-
-       for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
-
-               if ((*i)->region()->position() < start) {
-                       start = (*i)->region()->position();
-               }
-
-               if ((*i)->region()->last_frame() + 1 > end) {
-                       end = (*i)->region()->last_frame() + 1;
-               }
-
-               tracks.insert (&((*i)->get_time_axis_view()));
-       }
-
-       if ((start == 0 && end == 0) || end < start) {
+       if ( !get_selection_extents(start, end) )
                return;
-       }
 
        calc_extra_zoom_edges (start, end);
 
@@ -1702,7 +1900,7 @@ Editor::temporal_zoom_region (bool both_axes)
        PBD::Unwinder<bool> nsv (no_save_visual, true);
 
        temporal_zoom_by_frame (start, end);
-       
+
        if (both_axes) {
                uint32_t per_track_height = (uint32_t) floor ((_visible_canvas_height - 10.0) / tracks.size());
 
@@ -1728,35 +1926,73 @@ Editor::temporal_zoom_region (bool both_axes)
        redo_visual_stack.push_back (current_visual_state (both_axes));
 }
 
-void
-Editor::zoom_to_region (bool both_axes)
+
+bool
+Editor::get_selection_extents (framepos_t &start, framepos_t &end) const
 {
-       temporal_zoom_region (both_axes);
+       start = max_framepos;
+       end = 0;
+       bool ret = true;
+
+       //ToDo:  if notes are selected, set extents to that selection
+
+       //ToDo:  if control points are selected, set extents to that selection
+
+       if ( !selection->regions.empty() ) {
+               RegionSelection rs = get_regions_from_selection_and_entered ();
+
+               for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
+
+                       if ((*i)->region()->position() < start) {
+                               start = (*i)->region()->position();
+                       }
+
+                       if ((*i)->region()->last_frame() + 1 > end) {
+                               end = (*i)->region()->last_frame() + 1;
+                       }
+               }
+
+       } else if (!selection->time.empty()) {
+               start = selection->time.start();
+               end = selection->time.end_frame();
+       } else
+               ret = false;  //no selection found
+
+       //range check
+       if ((start == 0 && end == 0) || end < start) {
+               ret = false;
+       }
+
+       return ret;
 }
 
+
 void
 Editor::temporal_zoom_selection (bool both_axes)
 {
        if (!selection) return;
 
-       //if a range is selected, zoom to that
-       if (!selection->time.empty()) {
+       //ToDo:  if notes are selected, zoom to that
 
-               framepos_t start = selection->time.start();
-               framepos_t end = selection->time.end_frame();
+       //ToDo:  if control points are selected, zoom to that
 
-               calc_extra_zoom_edges(start, end);
+       //if region(s) are selected, zoom to that
+       if ( !selection->regions.empty() )
+               temporal_zoom_region (both_axes);
 
-               temporal_zoom_by_frame (start, end);
+       //if a range is selected, zoom to that
+       if (!selection->time.empty()) {
 
-               if (both_axes)
-                       fit_selected_tracks();
+               framepos_t start,  end;
+               if (get_selection_extents (start, end)) {
+                       calc_extra_zoom_edges(start, end);
+                       temporal_zoom_by_frame (start, end);
+               }
 
-       } else {
-               temporal_zoom_region (both_axes);
+               if (both_axes)
+                       fit_selection();
        }
 
-
 }
 
 void
@@ -1802,7 +2038,7 @@ Editor::temporal_zoom_by_frame (framepos_t start, framepos_t end)
        framepos_t range = end - start;
 
        const framecnt_t new_fpp = (framecnt_t) ceil ((double) range / (double) _visible_canvas_width);
-       
+
        framepos_t new_page = range;
        framepos_t middle = (framepos_t) floor ((double) start + ((double) range / 2.0f));
        framepos_t new_leftmost = (framepos_t) floor ((double) middle - ((double) new_page / 2.0f));
@@ -1855,7 +2091,7 @@ Editor::temporal_zoom_to_frame (bool coarser, framepos_t frame)
        /* zoom focus is automatically taken as @param frame when this
           method is used.
        */
-       
+
        framepos_t new_leftmost = frame - (framepos_t)range_before;
 
        if (new_leftmost > frame) {
@@ -1873,7 +2109,7 @@ Editor::temporal_zoom_to_frame (bool coarser, framepos_t frame)
 bool
 Editor::choose_new_marker_name(string &name) {
 
-       if (!Config->get_name_new_markers()) {
+       if (!UIConfiguration::instance().get_name_new_markers()) {
                /* don't prompt user for a new name */
                return true;
        }
@@ -1925,12 +2161,14 @@ Editor::add_location_from_selection ()
        _session->locations()->next_available_name(rangename,"selection");
        Location *location = new Location (*_session, start, end, rangename, Location::IsRangeMarker);
 
-       _session->begin_reversible_command (_("add marker"));
+       begin_reversible_command (_("add marker"));
+
        XMLNode &before = _session->locations()->get_state();
        _session->locations()->add (location, true);
        XMLNode &after = _session->locations()->get_state();
        _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-       _session->commit_reversible_command ();
+
+       commit_reversible_command ();
 }
 
 void
@@ -1945,12 +2183,64 @@ Editor::add_location_mark (framepos_t where)
                return;
        }
        Location *location = new Location (*_session, where, where, markername, Location::IsMark);
-       _session->begin_reversible_command (_("add marker"));
+       begin_reversible_command (_("add marker"));
+
        XMLNode &before = _session->locations()->get_state();
        _session->locations()->add (location, true);
        XMLNode &after = _session->locations()->get_state();
        _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-       _session->commit_reversible_command ();
+
+       commit_reversible_command ();
+}
+
+void
+Editor::set_session_start_from_playhead ()
+{
+       if (!_session)
+               return;
+
+       Location* loc;
+       if ((loc = _session->locations()->session_range_location()) == 0) {  //should never happen
+               _session->set_session_extents ( _session->audible_frame(), _session->audible_frame() );
+       } else {
+               XMLNode &before = loc->get_state();
+
+               _session->set_session_extents ( _session->audible_frame(), loc->end() );
+
+               XMLNode &after = loc->get_state();
+
+               begin_reversible_command (_("Set session start"));
+
+               _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
+
+               commit_reversible_command ();
+       }
+}
+
+void
+Editor::set_session_end_from_playhead ()
+{
+       if (!_session)
+               return;
+
+       Location* loc;
+       if ((loc = _session->locations()->session_range_location()) == 0) {  //should never happen
+               _session->set_session_extents ( _session->audible_frame(), _session->audible_frame() );
+       } else {
+               XMLNode &before = loc->get_state();
+
+               _session->set_session_extents ( loc->start(), _session->audible_frame() );
+
+               XMLNode &after = loc->get_state();
+
+               begin_reversible_command (_("Set session start"));
+
+               _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
+
+               commit_reversible_command ();
+       }
+
+       _session->set_end_is_free (false);
 }
 
 void
@@ -1963,9 +2253,7 @@ void
 Editor::remove_location_at_playhead_cursor ()
 {
        if (_session) {
-
                //set up for undo
-               _session->begin_reversible_command (_("remove marker"));
                XMLNode &before = _session->locations()->get_state();
                bool removed = false;
 
@@ -1978,12 +2266,13 @@ Editor::remove_location_at_playhead_cursor ()
                                removed = true;
                        }
                }
-               
+
                //store undo
                if (removed) {
+                       begin_reversible_command (_("remove marker"));
                        XMLNode &after = _session->locations()->get_state();
                        _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-                       _session->commit_reversible_command ();
+                       commit_reversible_command ();
                }
        }
 }
@@ -1997,8 +2286,8 @@ Editor::add_locations_from_region ()
        if (rs.empty()) {
                return;
        }
+       bool commit = false;
 
-       _session->begin_reversible_command (selection->regions.size () > 1 ? _("add markers") : _("add marker"));
        XMLNode &before = _session->locations()->get_state();
 
        for (RegionSelection::iterator i = rs.begin (); i != rs.end (); ++i) {
@@ -2008,11 +2297,15 @@ Editor::add_locations_from_region ()
                Location *location = new Location (*_session, region->position(), region->last_frame(), region->name(), Location::IsRangeMarker);
 
                _session->locations()->add (location, true);
+               commit = true;
        }
 
-       XMLNode &after = _session->locations()->get_state();
-       _session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-       _session->commit_reversible_command ();
+       if (commit) {
+               begin_reversible_command (selection->regions.size () > 1 ? _("add markers") : _("add marker"));
+               XMLNode &after = _session->locations()->get_state();
+               _session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
+               commit_reversible_command ();
+       }
 }
 
 /** Add a single range marker around all selected regions */
@@ -2025,7 +2318,6 @@ Editor::add_location_from_region ()
                return;
        }
 
-       _session->begin_reversible_command (_("add marker"));
        XMLNode &before = _session->locations()->get_state();
 
        string markername;
@@ -2046,9 +2338,10 @@ Editor::add_location_from_region ()
        Location *location = new Location (*_session, selection->regions.start(), selection->regions.end_frame(), markername, Location::IsRangeMarker);
        _session->locations()->add (location, true);
 
+       begin_reversible_command (_("add marker"));
        XMLNode &after = _session->locations()->get_state();
        _session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 /* MARKS */
@@ -2065,7 +2358,7 @@ Editor::jump_forward_to_mark ()
        if (pos < 0) {
                return;
        }
-       
+
        _session->request_locate (pos, _session->transport_rolling());
 }
 
@@ -2104,12 +2397,14 @@ void
 Editor::clear_markers ()
 {
        if (_session) {
-               _session->begin_reversible_command (_("clear markers"));
+               begin_reversible_command (_("clear markers"));
+
                XMLNode &before = _session->locations()->get_state();
                _session->locations()->clear_markers ();
                XMLNode &after = _session->locations()->get_state();
                _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-               _session->commit_reversible_command ();
+
+               commit_reversible_command ();
        }
 }
 
@@ -2117,27 +2412,30 @@ void
 Editor::clear_ranges ()
 {
        if (_session) {
-               _session->begin_reversible_command (_("clear ranges"));
+               begin_reversible_command (_("clear ranges"));
+
                XMLNode &before = _session->locations()->get_state();
 
                _session->locations()->clear_ranges ();
 
                XMLNode &after = _session->locations()->get_state();
                _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-               _session->commit_reversible_command ();
+
+               commit_reversible_command ();
        }
 }
 
 void
 Editor::clear_locations ()
 {
-       _session->begin_reversible_command (_("clear locations"));
+       begin_reversible_command (_("clear locations"));
+
        XMLNode &before = _session->locations()->get_state();
        _session->locations()->clear ();
        XMLNode &after = _session->locations()->get_state();
        _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-       _session->commit_reversible_command ();
-       _session->locations()->clear ();
+
+       commit_reversible_command ();
 }
 
 void
@@ -2263,7 +2561,7 @@ Editor::play_from_edit_point_and_return ()
        framepos_t start_frame;
        framepos_t return_frame;
 
-       start_frame = get_preferred_edit_position (true);
+       start_frame = get_preferred_edit_position ( EDIT_IGNORE_PHEAD );
 
        if (_session->transport_rolling()) {
                _session->request_locate (start_frame, false);
@@ -2284,35 +2582,39 @@ Editor::play_from_edit_point_and_return ()
 void
 Editor::play_selection ()
 {
-       if (selection->time.empty()) {
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
                return;
-       }
 
-       _session->request_play_range (&selection->time, true);
+       AudioRange ar (start, end, 0);
+       list<AudioRange> lar;
+       lar.push_back (ar);
+
+       _session->request_play_range (&lar, true);
 }
 
 framepos_t
 Editor::get_preroll ()
 {
-       return 1.0 /*Config->get_edit_preroll_seconds()*/ * _session->frame_rate();
+       return Config->get_preroll_seconds() * _session->frame_rate();
 }
 
 
 void
 Editor::maybe_locate_with_edit_preroll ( framepos_t location )
 {
-       if ( _session->transport_rolling() || !Config->get_follow_edits() || _ignore_follow_edits )
+       if ( _session->transport_rolling() || !UIConfiguration::instance().get_follow_edits() || _ignore_follow_edits || _session->config.get_external_sync() )
                return;
 
        location -= get_preroll();
-       
+
        //don't try to locate before the beginning of time
-       if ( location < 0 ) 
+       if ( location < 0 )
                location = 0;
-               
+
        //if follow_playhead is on, keep the playhead on the screen
        if ( _follow_playhead )
-               if ( location < leftmost_frame ) 
+               if ( location < leftmost_frame )
                        location = leftmost_frame;
 
        _session->request_locate( location );
@@ -2321,17 +2623,18 @@ Editor::maybe_locate_with_edit_preroll ( framepos_t location )
 void
 Editor::play_with_preroll ()
 {
-       if (selection->time.empty()) {
-               return;
-       } else {
+       {
                framepos_t preroll = get_preroll();
-               
-               framepos_t start = 0;
-               if (selection->time[clicked_selection].start > preroll)
-                       start = selection->time[clicked_selection].start - preroll;
-               
-               framepos_t end = selection->time[clicked_selection].end + preroll;
-               
+
+               framepos_t start, end;
+               if (!get_selection_extents ( start, end))
+                       return;
+
+               if (start > preroll)
+                       start = start - preroll;
+
+               end = end + preroll;  //"post-roll"
+
                AudioRange ar (start, end, 0);
                list<AudioRange> lar;
                lar.push_back (ar);
@@ -2392,7 +2695,7 @@ Editor::do_layer_operation (LayerOperation op)
                        begin_reversible_command (_("raise region to top"));
                }
                break;
-               
+
        case Lower:
                if (multiple) {
                        begin_reversible_command (_("lower regions"));
@@ -2400,7 +2703,7 @@ Editor::do_layer_operation (LayerOperation op)
                        begin_reversible_command (_("lower region"));
                }
                break;
-               
+
        case LowerToBottom:
                if (multiple) {
                        begin_reversible_command (_("lower regions to bottom"));
@@ -2414,7 +2717,7 @@ Editor::do_layer_operation (LayerOperation op)
        for (set<boost::shared_ptr<Playlist> >::iterator i = playlists.begin(); i != playlists.end(); ++i) {
                (*i)->clear_owned_changes ();
        }
-       
+
        for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
                boost::shared_ptr<Region> r = (*i)->region ();
                switch (op) {
@@ -2437,7 +2740,7 @@ Editor::do_layer_operation (LayerOperation op)
                (*i)->rdiff (cmds);
                _session->add_commands (cmds);
        }
-       
+
        commit_reversible_command ();
 }
 
@@ -2488,7 +2791,7 @@ Editor::rename_region ()
                return;
        }
 
-       ArdourDialog d (*this, _("Rename Region"), true, false);
+       ArdourDialog d (_("Rename Region"), true, false);
        Entry entry;
        Label label (_("New name:"));
        HBox hbox;
@@ -2530,28 +2833,9 @@ Editor::rename_region ()
        }
 }
 
+/** Start an audition of the first selected region */
 void
-Editor::audition_playlist_region_via_route (boost::shared_ptr<Region> region, Route& route)
-{
-       if (_session->is_auditioning()) {
-               _session->cancel_audition ();
-       }
-
-       // note: some potential for creativity here, because region doesn't
-       // have to belong to the playlist that Route is handling
-
-       // bool was_soloed = route.soloed();
-
-       route.set_solo (true, this);
-
-       _session->request_bounded_roll (region->position(), region->position() + region->length());
-
-       /* XXX how to unset the solo state ? */
-}
-
-/** Start an audition of the first selected region */
-void
-Editor::play_edit_range ()
+Editor::play_edit_range ()
 {
        framepos_t start, end;
 
@@ -2643,8 +2927,14 @@ Editor::create_region_from_selection (vector<boost::shared_ptr<Region> >& new_re
                return;
        }
 
-       framepos_t start = selection->time[clicked_selection].start;
-       framepos_t end = selection->time[clicked_selection].end;
+       framepos_t start, end;
+       if (clicked_selection) {
+               start = selection->time[clicked_selection].start;
+               end = selection->time[clicked_selection].end;
+       } else {
+               start = selection->time.start();
+               end = selection->time.end_frame();
+       }
 
        TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
        sort_track_selection (ts);
@@ -2703,6 +2993,7 @@ static void
 add_if_covered (RegionView* rv, const AudioRange* ar, RegionSelection* rs)
 {
        switch (rv->region()->coverage (ar->start, ar->end - 1)) {
+       // n.b. -1 because AudioRange::end is one past the end, but coverage expects inclusive ranges
        case Evoral::OverlapNone:
                break;
        default:
@@ -2760,62 +3051,63 @@ Editor::separate_regions_between (const TimeSelection& ts)
 
        for (TrackSelection::iterator i = tmptracks.begin(); i != tmptracks.end(); ++i) {
 
-               RouteTimeAxisView* rtv;
-
-               if ((rtv = dynamic_cast<RouteTimeAxisView*> ((*i))) != 0) {
+               RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> ((*i));
 
-                       if (rtv->is_track()) {
+               if (!rtv) {
+                       continue;
+               }
 
-                               /* no edits to destructive tracks */
+               if (!rtv->is_track()) {
+                       continue;
+               }
 
-                               if (rtv->track()->destructive()) {
-                                       continue;
-                               }
+               /* no edits to destructive tracks */
 
-                               if ((playlist = rtv->playlist()) != 0) {
+               if (rtv->track()->destructive()) {
+                       continue;
+               }
 
-                                       playlist->clear_changes ();
+               if ((playlist = rtv->playlist()) != 0) {
 
-                                       /* XXX need to consider musical time selections here at some point */
+                       playlist->clear_changes ();
 
-                                       double speed = rtv->track()->speed();
+                       /* XXX need to consider musical time selections here at some point */
 
+                       double speed = rtv->track()->speed();
 
-                                       for (list<AudioRange>::const_iterator t = ts.begin(); t != ts.end(); ++t) {
+                       for (list<AudioRange>::const_iterator t = ts.begin(); t != ts.end(); ++t) {
 
-                                               sigc::connection c = rtv->view()->RegionViewAdded.connect (
-                                                               sigc::mem_fun(*this, &Editor::collect_new_region_view));
+                               sigc::connection c = rtv->view()->RegionViewAdded.connect (
+                                       sigc::mem_fun(*this, &Editor::collect_new_region_view));
 
-                                               latest_regionviews.clear ();
+                               latest_regionviews.clear ();
 
-                                               playlist->partition ((framepos_t)((*t).start * speed),
-                                                               (framepos_t)((*t).end * speed), false);
+                               playlist->partition ((framepos_t)((*t).start * speed),
+                                                    (framepos_t)((*t).end * speed), false);
 
-                                               c.disconnect ();
+                               c.disconnect ();
 
-                                               if (!latest_regionviews.empty()) {
+                               if (!latest_regionviews.empty()) {
 
-                                                       rtv->view()->foreach_regionview (sigc::bind (
-                                                                               sigc::ptr_fun (add_if_covered),
-                                                                               &(*t), &new_selection));
+                                       rtv->view()->foreach_regionview (sigc::bind (
+                                                                                sigc::ptr_fun (add_if_covered),
+                                                                                &(*t), &new_selection));
 
-                                                       if (!in_command) {
-                                                               begin_reversible_command (_("separate"));
-                                                               in_command = true;
-                                                       }
+                                       if (!in_command) {
+                                               begin_reversible_command (_("separate"));
+                                               in_command = true;
+                                       }
 
-                                                       /* pick up changes to existing regions */
+                                       /* pick up changes to existing regions */
 
-                                                       vector<Command*> cmds;
-                                                       playlist->rdiff (cmds);
-                                                       _session->add_commands (cmds);
+                                       vector<Command*> cmds;
+                                       playlist->rdiff (cmds);
+                                       _session->add_commands (cmds);
 
-                                                       /* pick up changes to the playlist itself (adds/removes)
-                                                        */
+                                       /* pick up changes to the playlist itself (adds/removes)
+                                        */
 
-                                                       _session->add_command(new StatefulDiffCommand (playlist));
-                                               }
-                                       }
+                                       _session->add_command(new StatefulDiffCommand (playlist));
                                }
                        }
                }
@@ -2935,7 +3227,7 @@ Editor::separate_under_selected_regions ()
 
                if (!playlist) {
                        // is this check necessary?
-                       continue;
+                       continue;
                }
 
                vector<PlaylistState>::iterator i;
@@ -3010,17 +3302,18 @@ Editor::crop_region_to (framepos_t start, framepos_t end)
 
        for (TrackSelection::iterator i = ts.begin(); i != ts.end(); ++i) {
 
-               RouteTimeAxisView* rtv;
+               RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> ((*i));
 
-               if ((rtv = dynamic_cast<RouteTimeAxisView*> ((*i))) != 0) {
+               if (!rtv) {
+                       continue;
+               }
 
-                       boost::shared_ptr<Track> t = rtv->track();
+               boost::shared_ptr<Track> t = rtv->track();
 
-                       if (t != 0 && ! t->destructive()) {
+               if (t != 0 && ! t->destructive()) {
 
-                               if ((playlist = rtv->playlist()) != 0) {
-                                       playlists.push_back (playlist);
-                               }
+                       if ((playlist = rtv->playlist()) != 0) {
+                               playlists.push_back (playlist);
                        }
                }
        }
@@ -3029,121 +3322,98 @@ Editor::crop_region_to (framepos_t start, framepos_t end)
                return;
        }
 
-       framepos_t the_start;
-       framepos_t the_end;
-       framepos_t cnt;
-
-       begin_reversible_command (_("trim to selection"));
+       framepos_t pos;
+       framepos_t new_start;
+       framepos_t new_end;
+       framecnt_t new_length;
+       bool in_command = false;
 
        for (vector<boost::shared_ptr<Playlist> >::iterator i = playlists.begin(); i != playlists.end(); ++i) {
 
-               boost::shared_ptr<Region> region;
+               /* Only the top regions at start and end have to be cropped */
+               boost::shared_ptr<Region> region_at_start = (*i)->top_region_at(start);
+               boost::shared_ptr<Region> region_at_end = (*i)->top_region_at(end);
 
-               the_start = start;
+               vector<boost::shared_ptr<Region> > regions;
 
-               if ((region = (*i)->top_region_at(the_start)) == 0) {
-                       continue;
+               if (region_at_start != 0) {
+                       regions.push_back (region_at_start);
+               }
+               if (region_at_end != 0) {
+                       regions.push_back (region_at_end);
                }
 
-               /* now adjust lengths to that we do the right thing
-                  if the selection extends beyond the region
-               */
+               /* now adjust lengths */
+               for (vector<boost::shared_ptr<Region> >::iterator i = regions.begin(); i != regions.end(); ++i) {
 
-               the_start = max (the_start, (framepos_t) region->position());
-               if (max_framepos - the_start < region->length()) {
-                       the_end = the_start + region->length() - 1;
-               } else {
-                       the_end = max_framepos;
-               }
-               the_end = min (end, the_end);
-               cnt = the_end - the_start + 1;
+                       pos = (*i)->position();
+                       new_start = max (start, pos);
+                       if (max_framepos - pos > (*i)->length()) {
+                               new_end = pos + (*i)->length() - 1;
+                       } else {
+                               new_end = max_framepos;
+                       }
+                       new_end = min (end, new_end);
+                       new_length = new_end - new_start + 1;
 
-               region->clear_changes ();
-               region->trim_to (the_start, cnt);
-               _session->add_command (new StatefulDiffCommand (region));
+                       if(!in_command) {
+                               begin_reversible_command (_("trim to selection"));
+                               in_command = true;
+                       }
+                       (*i)->clear_changes ();
+                       (*i)->trim_to (new_start, new_length);
+                       _session->add_command (new StatefulDiffCommand (*i));
+               }
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
 Editor::region_fill_track ()
 {
-       RegionSelection rs = get_regions_from_selection_and_entered ();
-
-       if (!_session || rs.empty()) {
-               return;
-       }
+       boost::shared_ptr<Playlist> playlist;
+       RegionSelection regions = get_regions_from_selection_and_entered ();
+       RegionSelection foo;
 
        framepos_t const end = _session->current_end_frame ();
 
-       begin_reversible_command (Operations::region_fill);
-
-       for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
-
-               boost::shared_ptr<Region> region ((*i)->region());
-
-               boost::shared_ptr<Playlist> pl = region->playlist();
-
-               if (end <= region->last_frame()) {
-                       return;
-               }
-
-               double times = (double) (end - region->last_frame()) / (double) region->length();
-
-               if (times == 0) {
-                       return;
-               }
-
-               pl->clear_changes ();
-               pl->add_region (RegionFactory::create (region, true), region->last_frame(), times);
-               _session->add_command (new StatefulDiffCommand (pl));
-       }
-
-       commit_reversible_command ();
-}
-
-void
-Editor::region_fill_selection ()
-{
-       if (clicked_routeview == 0 || !clicked_routeview->is_audio_track()) {
-               return;
-       }
-
-       if (selection->time.empty()) {
+       if (regions.empty () || regions.end_frame () + 1 >= end) {
                return;
        }
 
-       boost::shared_ptr<Region> region = _regions->get_single_selection ();
-       if (region == 0) {
-               return;
-       }
+       framepos_t const start_frame = regions.start ();
+       framepos_t const end_frame = regions.end_frame ();
+       framecnt_t const gap = end_frame - start_frame + 1;
 
-       framepos_t start = selection->time[clicked_selection].start;
-       framepos_t end = selection->time[clicked_selection].end;
+       begin_reversible_command (Operations::region_fill);
 
-       boost::shared_ptr<Playlist> playlist;
+       selection->clear_regions ();
 
-       if (selection->tracks.empty()) {
-               return;
-       }
+       for (RegionSelection::iterator i = regions.begin(); i != regions.end(); ++i) {
 
-       framepos_t selection_length = end - start;
-       float times = (float)selection_length / region->length();
+               boost::shared_ptr<Region> r ((*i)->region());
 
-       begin_reversible_command (Operations::fill_selection);
+               TimeAxisView& tv = (*i)->get_time_axis_view();
+               RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (&tv);
+               latest_regionviews.clear ();
+               sigc::connection c = rtv->view()->RegionViewAdded.connect (sigc::mem_fun(*this, &Editor::collect_new_region_view));
 
-       TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
+               framepos_t const position = end_frame + (r->first_frame() - start_frame + 1);
+               playlist = (*i)->region()->playlist();
+               playlist->clear_changes ();
+               playlist->duplicate_until (r, position, gap, end);
+               _session->add_command(new StatefulDiffCommand (playlist));
 
-       for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
+               c.disconnect ();
 
-               if ((playlist = (*i)->playlist()) == 0) {
-                       continue;
-               }
+               foo.insert (foo.end(), latest_regionviews.begin(), latest_regionviews.end());
+       }
 
-               playlist->clear_changes ();
-               playlist->add_region (RegionFactory::create (region, true), start, times);
-               _session->add_command (new StatefulDiffCommand (playlist));
+       if (!foo.empty()) {
+               selection->set (foo);
        }
 
        commit_reversible_command ();
@@ -3444,8 +3714,7 @@ void
 Editor::trim_region_to_location (const Location& loc, const char* str)
 {
        RegionSelection rs = get_regions_from_selection_and_entered ();
-
-       begin_reversible_command (str);
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                RegionView* rv = (*x);
@@ -3476,10 +3745,17 @@ Editor::trim_region_to_location (const Location& loc, const char* str)
 
                rv->region()->clear_changes ();
                rv->region()->trim_to (start, (end - start));
+
+               if (!in_command) {
+                       begin_reversible_command (str);
+                       in_command = true;
+               }
                _session->add_command(new StatefulDiffCommand (rv->region()));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -3498,8 +3774,7 @@ void
 Editor::trim_to_region(bool forward)
 {
        RegionSelection rs = get_regions_from_selection_and_entered ();
-
-       begin_reversible_command (_("trim to region"));
+       bool in_command = false;
 
        boost::shared_ptr<Region> next_region;
 
@@ -3514,7 +3789,7 @@ Editor::trim_to_region(bool forward)
                AudioTimeAxisView* atav = dynamic_cast<AudioTimeAxisView*> (&arv->get_time_axis_view());
 
                if (!atav) {
-                       return;
+                       continue;
                }
 
                float speed = 1.0;
@@ -3553,10 +3828,16 @@ Editor::trim_to_region(bool forward)
                    arv->region_changed (ARDOUR::bounds_change);
                }
 
+               if (!in_command) {
+                       begin_reversible_command (_("trim to region"));
+                       in_command = true;
+               }
                _session->add_command(new StatefulDiffCommand (region));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -3596,7 +3877,7 @@ Editor::freeze_route ()
        /* stop transport before we start. this is important */
 
        _session->request_transport_speed (0.0);
-       
+
        /* wait for just a little while, because the above call is asynchronous */
 
        Glib::usleep (250000);
@@ -3641,14 +3922,14 @@ Editor::freeze_route ()
 
        pthread_create_and_store (X_("freezer"), &itt.thread, _freeze_thread, this);
 
-       set_canvas_cursor (_cursors->wait);
+       CursorContext::Handle cursor_ctx = CursorContext::create(*this, _cursors->wait);
 
        while (!itt.done && !itt.cancel) {
                gtk_main_iteration ();
        }
 
+       pthread_join (itt.thread, 0);
        current_interthread_info = 0;
-       set_canvas_cursor (current_canvas_cursor);
 }
 
 void
@@ -3682,21 +3963,20 @@ Editor::bounce_range_selection (bool replace, bool enable_processing)
        framepos_t start = selection->time[clicked_selection].start;
        framepos_t end = selection->time[clicked_selection].end;
        framepos_t cnt = end - start + 1;
-
-       begin_reversible_command (_("bounce range"));
+       bool in_command = false;
 
        for (TrackViewList::iterator i = views.begin(); i != views.end(); ++i) {
 
-               RouteTimeAxisView* rtv;
+               RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (*i);
 
-               if ((rtv = dynamic_cast<RouteTimeAxisView*> (*i)) == 0) {
+               if (!rtv) {
                        continue;
                }
 
                boost::shared_ptr<Playlist> playlist;
 
                if ((playlist = rtv->playlist()) == 0) {
-                       return;
+                       continue;
                }
 
                InterThreadInfo itt;
@@ -3723,6 +4003,10 @@ Editor::bounce_range_selection (bool replace, bool enable_processing)
                        playlist->add_region (r, start);
                }
 
+               if (!in_command) {
+                       begin_reversible_command (_("bounce range"));
+                       in_command = true;
+               }
                vector<Command*> cmds;
                playlist->rdiff (cmds);
                _session->add_commands (cmds);
@@ -3730,7 +4014,9 @@ Editor::bounce_range_selection (bool replace, bool enable_processing)
                _session->add_command (new StatefulDiffCommand (playlist));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 /** Delete selected regions, automation points or a time range */
@@ -3821,6 +4107,7 @@ Editor::cut_copy (CutCopyOp op)
                Location* loc = find_location_from_marker (entered_marker, ignored);
 
                if (_session && loc) {
+                       entered_marker = NULL;
                        Glib::signal_idle().connect (sigc::bind (sigc::mem_fun(*this, &Editor::really_remove_marker), loc));
                }
 
@@ -3828,20 +4115,15 @@ Editor::cut_copy (CutCopyOp op)
                return;
        }
 
-       if (internal_editing()) {
-
-               switch (effective_mouse_mode()) {
-               case MouseObject:
-               case MouseRange:
-                       begin_reversible_command (opname + ' ' + X_("MIDI"));
-                       cut_copy_midi (op);
-                       commit_reversible_command ();
-                       break;
-               default:
-                       break;
-               }
-
+       switch (mouse_mode) {
+       case MouseDraw:
+       case MouseContent:
+               begin_reversible_command (opname + ' ' + X_("MIDI"));
+               cut_copy_midi (op);
+               commit_reversible_command ();
                return;
+       default:
+               break;
        }
 
        bool did_edit = false;
@@ -3852,15 +4134,15 @@ Editor::cut_copy (CutCopyOp op)
 
                if (!selection->regions.empty()) {
                        cut_copy_regions (op, selection->regions);
-                       
+
                        if (op == Cut || op == Delete) {
                                selection->clear_regions ();
                        }
                }
-               
+
                if (!selection->points.empty()) {
                        cut_copy_points (op);
-                       
+
                        if (op == Cut || op == Delete) {
                                selection->clear_points ();
                        }
@@ -3878,19 +4160,19 @@ Editor::cut_copy (CutCopyOp op)
 
                did_edit = true;
                cut_copy_ranges (op);
-               
+
                if (op == Cut || op == Delete) {
                        selection->clear_time ();
                }
        }
-       
+
        if (did_edit) {
                /* reset repeated paste state */
                paste_count    = 0;
                last_paste_pos = 0;
-               commit_reversible_command ();   
+               commit_reversible_command ();
        }
-       
+
        if (op == Delete || op == Cut || op == Clear) {
                _drags->abort ();
        }
@@ -3899,7 +4181,7 @@ Editor::cut_copy (CutCopyOp op)
 struct AutomationRecord {
        AutomationRecord () : state (0) , line(NULL) {}
        AutomationRecord (XMLNode* s, const AutomationLine* l) : state (s) , line (l) {}
-       
+
        XMLNode* state; ///< state before any operation
        const AutomationLine* line; ///< line this came from
        boost::shared_ptr<Evoral::ControlList> copy; ///< copied events for the cut buffer
@@ -3909,7 +4191,7 @@ struct AutomationRecord {
  *  @param op Operation (Cut, Copy or Clear)
  */
 void
-Editor::cut_copy_points (CutCopyOp op)
+Editor::cut_copy_points (Editing::CutCopyOp op, Evoral::Beats earliest, bool midi)
 {
        if (selection->points.empty ()) {
                return;
@@ -3938,31 +4220,45 @@ Editor::cut_copy_points (CutCopyOp op)
                /* This operation will involve putting things in the cut buffer, so create an empty
                   ControlList for each of our source lists to put the cut buffer data in.
                */
-               framepos_t start = std::numeric_limits<framepos_t>::max();
                for (Lists::iterator i = lists.begin(); i != lists.end(); ++i) {
-                       i->second.copy = i->first->create (i->first->parameter ());
-
-                       /* Calculate earliest start position of any point in selection. */
-                       start = std::min(start, i->second.line->session_position(i->first->begin()));
+                       i->second.copy = i->first->create (i->first->parameter (), i->first->descriptor());
                }
 
                /* Add all selected points to the relevant copy ControlLists */
+               framepos_t start = std::numeric_limits<framepos_t>::max();
                for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
                        boost::shared_ptr<AutomationList> al = (*i)->line().the_list();
-                       AutomationList::const_iterator j = (*i)->model ();
+                       AutomationList::const_iterator    j  = (*i)->model();
+
                        lists[al].copy->fast_simple_add ((*j)->when, (*j)->value);
+                       if (midi) {
+                               /* Update earliest MIDI start time in beats */
+                               earliest = std::min(earliest, Evoral::Beats((*j)->when));
+                       } else {
+                               /* Update earliest session start time in frames */
+                               start = std::min(start, (*i)->line().session_position(j));
+                       }
                }
 
                /* Snap start time backwards, so copy/paste is snap aligned. */
-               snap_to(start, RoundDownMaybe);
+               if (midi) {
+                       if (earliest == Evoral::Beats::max()) {
+                               earliest = Evoral::Beats();  // Weird... don't offset
+                       }
+                       earliest.round_down_to_beat();
+               } else {
+                       if (start == std::numeric_limits<double>::max()) {
+                               start = 0;  // Weird... don't offset
+                       }
+                       snap_to(start, RoundDownMaybe);
+               }
 
+               const double line_offset = midi ? earliest.to_double() : start;
                for (Lists::iterator i = lists.begin(); i != lists.end(); ++i) {
                        /* Correct this copy list so that it is relative to the earliest
                           start time, so relative ordering between points is preserved
-                          when copying from several lists. */
-                       const AutomationLine* line        = i->second.line;
-                       const double          line_offset = line->time_converter().from(start);
-
+                          when copying from several lists and the paste starts at the
+                          earliest copied piece of data. */
                        for (AutomationList::iterator j = i->second.copy->begin(); j != i->second.copy->end(); ++j) {
                                (*j)->when -= line_offset;
                        }
@@ -3971,10 +4267,10 @@ Editor::cut_copy_points (CutCopyOp op)
                        cut_buffer->add (i->second.copy);
                }
        }
-               
+
        if (op == Delete || op == Cut) {
                /* This operation needs to remove things from the main AutomationList, so do that now */
-               
+
                for (Lists::iterator i = lists.begin(); i != lists.end(); ++i) {
                        i->first->freeze ();
                }
@@ -4000,15 +4296,26 @@ Editor::cut_copy_points (CutCopyOp op)
 void
 Editor::cut_copy_midi (CutCopyOp op)
 {
+       Evoral::Beats earliest = Evoral::Beats::max();
        for (MidiRegionSelection::iterator i = selection->midi_regions.begin(); i != selection->midi_regions.end(); ++i) {
                MidiRegionView* mrv = dynamic_cast<MidiRegionView*>(*i);
                if (mrv) {
+                       if (!mrv->selection().empty()) {
+                               earliest = std::min(earliest, (*mrv->selection().begin())->note()->time());
+                       }
                        mrv->cut_copy_clear (op);
 
                        /* XXX: not ideal, as there may be more than one track involved in the selection */
                        _last_cut_copy_source_track = &mrv->get_time_axis_view();
                }
        }
+
+       if (!selection->points.empty()) {
+               cut_copy_points (op, earliest, true);
+               if (op == Cut || op == Delete) {
+                       selection->clear_points ();
+               }
+       }
 }
 
 struct lt_playlist {
@@ -4032,6 +4339,8 @@ Editor::remove_clicked_region ()
                return;
        }
 
+       begin_reversible_command (_("remove region"));
+
        boost::shared_ptr<Playlist> playlist = clicked_routeview->playlist();
 
        playlist->clear_changes ();
@@ -4046,7 +4355,7 @@ Editor::remove_clicked_region ()
        vector<Command*> cmds;
        playlist->rdiff (cmds);
        _session->add_commands (cmds);
-       
+
        _session->add_command(new StatefulDiffCommand (playlist));
        commit_reversible_command ();
 }
@@ -4062,8 +4371,6 @@ Editor::remove_selected_regions ()
                return;
        }
 
-       begin_reversible_command (_("remove region"));
-
        list<boost::shared_ptr<Region> > regions_to_remove;
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
@@ -4087,7 +4394,7 @@ Editor::remove_selected_regions ()
 
                if (!playlist) {
                        // is this check necessary?
-                       continue;
+                       continue;
                }
 
                /* get_regions_from_selection_and_entered() guarantees that
@@ -4107,6 +4414,7 @@ Editor::remove_selected_regions ()
        }
 
        vector<boost::shared_ptr<Playlist> >::iterator pl;
+       bool in_command = false;
 
        for (pl = playlists.begin(); pl != playlists.end(); ++pl) {
                (*pl)->thaw ();
@@ -4114,14 +4422,21 @@ Editor::remove_selected_regions ()
                /* We might have removed regions, which alters other regions' layering_index,
                   so we need to do a recursive diff here.
                */
+
+               if (!in_command) {
+                       begin_reversible_command (_("remove region"));
+                       in_command = true;
+               }
                vector<Command*> cmds;
                (*pl)->rdiff (cmds);
                _session->add_commands (cmds);
-               
+
                _session->add_command(new StatefulDiffCommand (*pl));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 /** Cut, copy or clear selected regions.
@@ -4207,15 +4522,15 @@ Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
                if (op != Delete) {
 
                        vector<PlaylistMapping>::iterator z;
-                       
+
                        for (z = pmap.begin(); z != pmap.end(); ++z) {
                                if ((*z).tv == &tv) {
                                        break;
                                }
                        }
-                       
+
                        assert (z != pmap.end());
-                       
+
                        if (!(*z).pl) {
                                npl = PlaylistFactory::create (pl->data_type(), *_session, "cutlist", true);
                                npl->freeze();
@@ -4236,7 +4551,7 @@ Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
                        if (Config->get_edit_mode() == Ripple)
                                pl->ripple (r->position(), -r->length(), boost::shared_ptr<Region>());
                        break;
-                       
+
                case Cut:
                        _xx = RegionFactory::create (r);
                        npl->add_region (_xx, r->position() - first_position);
@@ -4263,20 +4578,20 @@ Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
        if (op != Delete) {
 
                list<boost::shared_ptr<Playlist> > foo;
-               
-               /* the pmap is in the same order as the tracks in which selected regions occured */
-               
+
+               /* the pmap is in the same order as the tracks in which selected regions occurred */
+
                for (vector<PlaylistMapping>::iterator i = pmap.begin(); i != pmap.end(); ++i) {
                        if ((*i).pl) {
                                (*i).pl->thaw();
                                foo.push_back ((*i).pl);
                        }
                }
-               
+
                if (!foo.empty()) {
                        cut_buffer->set (foo);
                }
-               
+
                if (pmap.empty()) {
                        _last_cut_copy_source_track = 0;
                } else {
@@ -4293,7 +4608,7 @@ Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
                vector<Command*> cmds;
                (*pl)->rdiff (cmds);
                _session->add_commands (cmds);
-               
+
                _session->add_command (new StatefulDiffCommand (*pl));
        }
 }
@@ -4316,7 +4631,7 @@ Editor::cut_copy_ranges (CutCopyOp op)
                        return;
                }
                ts.push_back (entered_track);
-       } 
+       }
 
        for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
                (*i)->cut_copy_clear (*selection, op);
@@ -4328,7 +4643,7 @@ Editor::paste (float times, bool from_context)
 {
         DEBUG_TRACE (DEBUG::CutNPaste, "paste to preferred edit pos\n");
 
-       paste_internal (get_preferred_edit_position (false, from_context), times);
+       paste_internal (get_preferred_edit_position (EDIT_IGNORE_NONE, from_context), times, get_grid_music_divisions (0));
 }
 
 void
@@ -4342,11 +4657,11 @@ Editor::mouse_paste ()
        }
 
        snap_to (where);
-       paste_internal (where, 1);
+       paste_internal (where, 1, get_grid_music_divisions (0));
 }
 
 void
-Editor::paste_internal (framepos_t position, float times)
+Editor::paste_internal (framepos_t position, float times, const int32_t sub_num)
 {
         DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("apparent paste position is %1\n", position));
 
@@ -4379,7 +4694,7 @@ Editor::paste_internal (framepos_t position, float times)
                sort_track_selection (ts);
        } else {
                /* Figure out which track to base the paste at. */
-               TimeAxisView* base_track;
+               TimeAxisView* base_track = NULL;
                if (_edit_point == Editing::EditAtMouse && entered_track) {
                        /* With the mouse edit point, paste onto the track under the mouse. */
                        base_track = entered_track;
@@ -4389,6 +4704,9 @@ Editor::paste_internal (framepos_t position, float times)
                } else if (_last_cut_copy_source_track) {
                        /* Paste to the track that the cut/copy came from (see mantis #333). */
                        base_track = _last_cut_copy_source_track;
+               } else {
+                       /* This is "impossible" since we've copied... well, do nothing. */
+                       return;
                }
 
                /* Walk up to parent if necessary, so base track is a route. */
@@ -4428,49 +4746,43 @@ Editor::paste_internal (framepos_t position, float times)
                   R1.A1, R1.A2, R2, R2.A1, ... */
        }
 
-       if (internal_editing ()) {
-
-               /* undo/redo is handled by individual tracks/regions */
-
-               RegionSelection rs;
-               RegionSelection::iterator r;
-               MidiNoteSelection::iterator cb;
+       begin_reversible_command (Operations::paste);
 
-               get_regions_at (rs, position, ts);
+       if (ts.size() == 1 && cut_buffer->lines.size() == 1 &&
+           dynamic_cast<AutomationTimeAxisView*>(ts.front())) {
+           /* Only one line copied, and one automation track selected.  Do a
+              "greedy" paste from one automation type to another. */
 
-               for (cb = cut_buffer->midi_notes.begin(), r = rs.begin();
-                    cb != cut_buffer->midi_notes.end() && r != rs.end(); ++r) {
-                       MidiRegionView* mrv = dynamic_cast<MidiRegionView*> (*r);
-                       if (mrv) {
-                               mrv->paste (position, paste_count, times, **cb);
-                               ++cb;
-                       }
-               }
+           PasteContext ctx(paste_count, times, ItemCounts(), true);
+           ts.front()->paste (position, *cut_buffer, ctx, sub_num);
 
        } else {
 
-               /* we do redo (do you do voodoo?) */
+               /* Paste into tracks */
 
-               begin_reversible_command (Operations::paste);
-
-               ItemCounts counts;
+               PasteContext ctx(paste_count, times, ItemCounts(), false);
                for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
-                       (*i)->paste (position, paste_count, times, *cut_buffer, counts);
+                       (*i)->paste (position, *cut_buffer, ctx, sub_num);
                }
-
-               commit_reversible_command ();
        }
+
+       commit_reversible_command ();
 }
 
 void
 Editor::duplicate_some_regions (RegionSelection& regions, float times)
 {
+       if (regions.empty ()) {
+               return;
+       }
+
        boost::shared_ptr<Playlist> playlist;
        RegionSelection sel = regions; // clear (below) may  clear the argument list if its the current region selection
        RegionSelection foo;
 
        framepos_t const start_frame = regions.start ();
        framepos_t const end_frame = regions.end_frame ();
+       framecnt_t const gap = end_frame - start_frame + 1;
 
        begin_reversible_command (Operations::duplicate_region);
 
@@ -4485,9 +4797,10 @@ Editor::duplicate_some_regions (RegionSelection& regions, float times)
                latest_regionviews.clear ();
                sigc::connection c = rtv->view()->RegionViewAdded.connect (sigc::mem_fun(*this, &Editor::collect_new_region_view));
 
-               playlist = (*i)->region()->playlist();
+               framepos_t const position = end_frame + (r->first_frame() - start_frame + 1);
+               playlist = (*i)->region()->playlist();
                playlist->clear_changes ();
-               playlist->duplicate (r, end_frame + (r->first_frame() - start_frame), times);
+               playlist->duplicate (r, position, gap, times);
                _session->add_command(new StatefulDiffCommand (playlist));
 
                c.disconnect ();
@@ -4495,11 +4808,11 @@ Editor::duplicate_some_regions (RegionSelection& regions, float times)
                foo.insert (foo.end(), latest_regionviews.begin(), latest_regionviews.end());
        }
 
-       commit_reversible_command ();
-
        if (!foo.empty()) {
                selection->set (foo);
        }
+
+       commit_reversible_command ();
 }
 
 void
@@ -4510,39 +4823,49 @@ Editor::duplicate_selection (float times)
        }
 
        boost::shared_ptr<Playlist> playlist;
-       vector<boost::shared_ptr<Region> > new_regions;
-       vector<boost::shared_ptr<Region> >::iterator ri;
-
-       create_region_from_selection (new_regions);
-
-       if (new_regions.empty()) {
-               return;
-       }
-
-       begin_reversible_command (_("duplicate selection"));
-
-       ri = new_regions.begin();
 
        TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
 
+       bool in_command = false;
+
        for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
                if ((playlist = (*i)->playlist()) == 0) {
                        continue;
                }
                playlist->clear_changes ();
-               playlist->duplicate (*ri, selection->time[clicked_selection].end, times);
-               _session->add_command (new StatefulDiffCommand (playlist));
 
-               ++ri;
-               if (ri == new_regions.end()) {
-                       --ri;
+               if (clicked_selection) {
+                       playlist->duplicate_range (selection->time[clicked_selection], times);
+               } else {
+                       playlist->duplicate_ranges (selection->time, times);
                }
-       }
 
-       commit_reversible_command ();
-}
+               if (!in_command) {
+                       begin_reversible_command (_("duplicate range selection"));
+                       in_command = true;
+               }
+               _session->add_command (new StatefulDiffCommand (playlist));
 
-/** Reset all selected points to the relevant default value */
+       }
+
+       if (in_command) {
+               // now "move" range selection to after the current range selection
+               framecnt_t distance = 0;
+
+               if (clicked_selection) {
+                       distance = selection->time[clicked_selection].end -
+                                  selection->time[clicked_selection].start;
+               } else {
+                       distance = selection->time.end_frame() - selection->time.start();
+               }
+
+               selection->move_time (distance);
+
+               commit_reversible_command ();
+       }
+}
+
+/** Reset all selected points to the relevant default value */
 void
 Editor::reset_point_selection ()
 {
@@ -4597,9 +4920,8 @@ Editor::nudge_track (bool use_edit, bool forwards)
                return;
        }
 
-       begin_reversible_command (_("nudge track"));
-
        TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
+       bool in_command = false;
 
        for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
 
@@ -4612,6 +4934,10 @@ Editor::nudge_track (bool use_edit, bool forwards)
 
                playlist->nudge_after (start, distance, forwards);
 
+               if (!in_command) {
+                       begin_reversible_command (_("nudge track"));
+                       in_command = true;
+               }
                vector<Command*> cmds;
 
                playlist->rdiff (cmds);
@@ -4620,7 +4946,9 @@ Editor::nudge_track (bool use_edit, bool forwards)
                _session->add_command (new StatefulDiffCommand (playlist));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -4672,7 +5000,7 @@ Editor::normalize_region ()
                return;
        }
 
-       set_canvas_cursor (_cursors->wait);
+       CursorContext::Handle cursor_ctx = CursorContext::create(*this, _cursors->wait);
        gdk_flush ();
 
        /* XXX: should really only count audio regions here */
@@ -4691,7 +5019,6 @@ Editor::normalize_region ()
 
                        if (a == -1) {
                                /* the user cancelled the operation */
-                               set_canvas_cursor (current_canvas_cursor);
                                return;
                        }
 
@@ -4701,9 +5028,8 @@ Editor::normalize_region ()
                }
        }
 
-       begin_reversible_command (_("normalize"));
-
        list<double>::const_iterator a = max_amps.begin ();
+       bool in_command = false;
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*> (*r);
@@ -4716,13 +5042,19 @@ Editor::normalize_region ()
                double const amp = dialog.normalize_individually() ? *a : max_amp;
 
                arv->audio_region()->normalize (amp, dialog.target ());
+
+               if (!in_command) {
+                       begin_reversible_command (_("normalize"));
+                       in_command = true;
+               }
                _session->add_command (new StatefulDiffCommand (arv->region()));
 
                ++a;
        }
 
-       commit_reversible_command ();
-       set_canvas_cursor (current_canvas_cursor);
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 
@@ -4739,7 +5071,7 @@ Editor::reset_region_scale_amplitude ()
                return;
        }
 
-       begin_reversible_command ("reset gain");
+       bool in_command = false;
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
@@ -4747,10 +5079,17 @@ Editor::reset_region_scale_amplitude ()
                        continue;
                arv->region()->clear_changes ();
                arv->audio_region()->set_scale_amplitude (1.0f);
+
+               if(!in_command) {
+                               begin_reversible_command ("reset gain");
+                               in_command = true;
+               }
                _session->add_command (new StatefulDiffCommand (arv->region()));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -4762,7 +5101,7 @@ Editor::adjust_region_gain (bool up)
                return;
        }
 
-       begin_reversible_command ("adjust region gain");
+       bool in_command = false;
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
@@ -4781,10 +5120,17 @@ Editor::adjust_region_gain (bool up)
                }
 
                arv->audio_region()->set_scale_amplitude (dB_to_coefficient (dB));
+
+               if (!in_command) {
+                               begin_reversible_command ("adjust region gain");
+                               in_command = true;
+               }
                _session->add_command (new StatefulDiffCommand (arv->region()));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 
@@ -4821,15 +5167,18 @@ Editor::strip_region_silence ()
                }
        }
 
+       assert (!audio_only.empty());
+
        StripSilenceDialog d (_session, audio_only);
        int const r = d.run ();
 
-        d.drop_rects ();
+       d.drop_rects ();
 
-        if (r == Gtk::RESPONSE_OK) {
-                ARDOUR::AudioIntervalMap silences;
-                d.silences (silences);
+       if (r == Gtk::RESPONSE_OK) {
+               ARDOUR::AudioIntervalMap silences;
+               d.silences (silences);
                StripSilence s (*_session, silences, d.fade_length());
+
                apply_filter (s, _("strip silence"), &d);
        }
 }
@@ -4837,40 +5186,40 @@ Editor::strip_region_silence ()
 Command*
 Editor::apply_midi_note_edit_op_to_region (MidiOperator& op, MidiRegionView& mrv)
 {
-       Evoral::Sequence<Evoral::MusicalTime>::Notes selected;
+       Evoral::Sequence<Evoral::Beats>::Notes selected;
        mrv.selection_as_notelist (selected, true);
 
-       vector<Evoral::Sequence<Evoral::MusicalTime>::Notes> v;
+       vector<Evoral::Sequence<Evoral::Beats>::Notes> v;
        v.push_back (selected);
 
-       framepos_t pos_frames = mrv.midi_region()->position() - mrv.midi_region()->start();
-       double     pos_beats  = _session->tempo_map().framewalk_to_beats(0, pos_frames);
+       framepos_t    pos_frames = mrv.midi_region()->position() - mrv.midi_region()->start();
+       Evoral::Beats pos_beats  = _session->tempo_map().framewalk_to_beats(0, pos_frames);
 
        return op (mrv.midi_region()->model(), pos_beats, v);
 }
 
 void
-Editor::apply_midi_note_edit_op (MidiOperator& op)
+Editor::apply_midi_note_edit_op (MidiOperator& op, const RegionSelection& rs)
 {
-       Command* cmd;
-
-       RegionSelection rs = get_regions_from_selection_and_entered ();
-
        if (rs.empty()) {
                return;
        }
 
-       begin_reversible_command (op.name ());
+       bool in_command = false;
 
-       for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ) {
-               RegionSelection::iterator tmp = r;
+       for (RegionSelection::const_iterator r = rs.begin(); r != rs.end(); ) {
+               RegionSelection::const_iterator tmp = r;
                ++tmp;
 
                MidiRegionView* const mrv = dynamic_cast<MidiRegionView*> (*r);
 
                if (mrv) {
-                       cmd = apply_midi_note_edit_op_to_region (op, *mrv);
+                       Command* cmd = apply_midi_note_edit_op_to_region (op, *mrv);
                        if (cmd) {
+                               if (!in_command) {
+                                       begin_reversible_command (op.name ());
+                                       in_command = true;
+                               }
                                (*cmd)();
                                _session->add_command (cmd);
                        }
@@ -4879,7 +5228,9 @@ Editor::apply_midi_note_edit_op (MidiOperator& op)
                r = tmp;
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -4891,9 +5242,9 @@ Editor::fork_region ()
                return;
        }
 
-       begin_reversible_command (_("Fork Region(s)"));
+       CursorContext::Handle cursor_ctx = CursorContext::create(*this, _cursors->wait);
+       bool in_command = false;
 
-       set_canvas_cursor (_cursors->wait);
        gdk_flush ();
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ) {
@@ -4907,7 +5258,11 @@ Editor::fork_region ()
                                boost::shared_ptr<Playlist> playlist = mrv->region()->playlist();
                                boost::shared_ptr<MidiSource> new_source = _session->create_midi_source_by_stealing_name (mrv->midi_view()->track());
                                boost::shared_ptr<MidiRegion> newregion = mrv->midi_region()->clone (new_source);
-                               
+
+                               if (!in_command) {
+                                       begin_reversible_command (_("Fork Region(s)"));
+                                       in_command = true;
+                               }
                                playlist->clear_changes ();
                                playlist->replace_region (mrv->region(), newregion, mrv->region()->position());
                                _session->add_command(new StatefulDiffCommand (playlist));
@@ -4919,49 +5274,114 @@ Editor::fork_region ()
                r = tmp;
        }
 
-       commit_reversible_command ();
-
-       set_canvas_cursor (current_canvas_cursor);
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
 Editor::quantize_region ()
 {
-       int selected_midi_region_cnt = 0;
+       if (_session) {
+               quantize_regions(get_regions_from_selection_and_entered ());
+       }
+}
 
-       if (!_session) {
+void
+Editor::quantize_regions (const RegionSelection& rs)
+{
+       if (rs.n_midi_regions() == 0) {
                return;
        }
 
-       RegionSelection rs = get_regions_from_selection_and_entered ();
+       if (!quantize_dialog) {
+               quantize_dialog = new QuantizeDialog (*this);
+       }
 
-       if (rs.empty()) {
+       quantize_dialog->present ();
+       const int r = quantize_dialog->run ();
+       quantize_dialog->hide ();
+
+       if (r == Gtk::RESPONSE_OK) {
+               Quantize quant (quantize_dialog->snap_start(),
+                               quantize_dialog->snap_end(),
+                               quantize_dialog->start_grid_size(),
+                               quantize_dialog->end_grid_size(),
+                               quantize_dialog->strength(),
+                               quantize_dialog->swing(),
+                               quantize_dialog->threshold());
+
+               apply_midi_note_edit_op (quant, rs);
+       }
+}
+
+void
+Editor::legatize_region (bool shrink_only)
+{
+       if (_session) {
+               legatize_regions(get_regions_from_selection_and_entered (), shrink_only);
+       }
+}
+
+void
+Editor::legatize_regions (const RegionSelection& rs, bool shrink_only)
+{
+       if (rs.n_midi_regions() == 0) {
                return;
        }
 
-       for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
-               MidiRegionView* const mrv = dynamic_cast<MidiRegionView*> (*r);
-               if (mrv) {
-                       selected_midi_region_cnt++;
-               }
+       Legatize legatize(shrink_only);
+       apply_midi_note_edit_op (legatize, rs);
+}
+
+void
+Editor::transform_region ()
+{
+       if (_session) {
+               transform_regions(get_regions_from_selection_and_entered ());
        }
+}
 
-       if (selected_midi_region_cnt == 0) {
+void
+Editor::transform_regions (const RegionSelection& rs)
+{
+       if (rs.n_midi_regions() == 0) {
                return;
        }
 
-       QuantizeDialog* qd = new QuantizeDialog (*this);
+       TransformDialog td;
 
-       qd->present ();
-       const int r = qd->run ();
-       qd->hide ();
+       td.present();
+       const int r = td.run();
+       td.hide();
 
        if (r == Gtk::RESPONSE_OK) {
-               Quantize quant (*_session, qd->snap_start(), qd->snap_end(),
-                               qd->start_grid_size(), qd->end_grid_size(),
-                               qd->strength(), qd->swing(), qd->threshold());
+               Transform transform(td.get());
+               apply_midi_note_edit_op(transform, rs);
+       }
+}
+
+void
+Editor::transpose_region ()
+{
+       if (_session) {
+               transpose_regions(get_regions_from_selection_and_entered ());
+       }
+}
+
+void
+Editor::transpose_regions (const RegionSelection& rs)
+{
+       if (rs.n_midi_regions() == 0) {
+               return;
+       }
+
+       TransposeDialog d;
+       int const r = d.run ();
 
-               apply_midi_note_edit_op (quant);
+       if (r == RESPONSE_ACCEPT) {
+               Transpose transpose(d.semitones ());
+               apply_midi_note_edit_op (transpose, rs);
        }
 }
 
@@ -4974,7 +5394,7 @@ Editor::insert_patch_change (bool from_context)
                return;
        }
 
-       const framepos_t p = get_preferred_edit_position (false, from_context);
+       const framepos_t p = get_preferred_edit_position (EDIT_IGNORE_NONE, from_context);
 
        /* XXX: bit of a hack; use the MIDNAM from the first selected region;
           there may be more than one, but the PatchChangeDialog can only offer
@@ -4982,7 +5402,7 @@ Editor::insert_patch_change (bool from_context)
        */
        MidiRegionView* first = dynamic_cast<MidiRegionView*> (rs.front ());
 
-       Evoral::PatchChange<Evoral::MusicalTime> empty (0, 0, 0, 0);
+       Evoral::PatchChange<Evoral::Beats> empty (Evoral::Beats(), 0, 0, 0);
         PatchChangeDialog d (0, _session, empty, first->instrument_info(), Gtk::Stock::ADD);
 
        if (d.run() == RESPONSE_CANCEL) {
@@ -5008,9 +5428,9 @@ Editor::apply_filter (Filter& filter, string command, ProgressReporter* progress
                return;
        }
 
-       begin_reversible_command (command);
+       CursorContext::Handle cursor_ctx = CursorContext::create(*this, _cursors->wait);
+       bool in_command = false;
 
-       set_canvas_cursor (_cursors->wait);
        gdk_flush ();
 
        int n = 0;
@@ -5033,6 +5453,11 @@ Editor::apply_filter (Filter& filter, string command, ProgressReporter* progress
                                playlist->clear_changes ();
                                playlist->clear_owned_changes ();
 
+                               if (!in_command) {
+                                       begin_reversible_command (command);
+                                       in_command = true;
+                               }
+
                                if (filter.results.empty ()) {
 
                                        /* no regions returned; remove the old one */
@@ -5060,10 +5485,8 @@ Editor::apply_filter (Filter& filter, string command, ProgressReporter* progress
                                vector<Command*> cmds;
                                playlist->rdiff (cmds);
                                _session->add_commands (cmds);
-                               
+
                                _session->add_command(new StatefulDiffCommand (playlist));
-                       } else {
-                               goto out;
                        }
 
                        if (progress) {
@@ -5075,10 +5498,9 @@ Editor::apply_filter (Filter& filter, string command, ProgressReporter* progress
                ++n;
        }
 
-       commit_reversible_command ();
-
-  out:
-       set_canvas_cursor (current_canvas_cursor);
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5096,7 +5518,7 @@ Editor::reset_region_gain_envelopes ()
                return;
        }
 
-       _session->begin_reversible_command (_("reset region gain"));
+       bool in_command = false;
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*i);
@@ -5105,11 +5527,18 @@ Editor::reset_region_gain_envelopes ()
                        XMLNode& before (alist->get_state());
 
                        arv->audio_region()->set_default_envelope ();
+
+                       if (!in_command) {
+                               begin_reversible_command (_("reset region gain"));
+                               in_command = true;
+                       }
                        _session->add_command (new MementoCommand<AutomationList>(*arv->audio_region()->envelope().get(), &before, &alist->get_state()));
                }
        }
 
-       _session->commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5149,18 +5578,25 @@ Editor::toggle_gain_envelope_active ()
                return;
        }
 
-       _session->begin_reversible_command (_("region gain envelope active"));
+       bool in_command = false;
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*i);
                if (arv) {
                        arv->region()->clear_changes ();
                        arv->audio_region()->set_envelope_active (!arv->audio_region()->envelope_active());
+
+                       if (!in_command) {
+                               begin_reversible_command (_("region gain envelope active"));
+                               in_command = true;
+                       }
                        _session->add_command (new StatefulDiffCommand (arv->region()));
                }
        }
 
-       _session->commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5176,7 +5612,7 @@ Editor::toggle_region_lock ()
                return;
        }
 
-       _session->begin_reversible_command (_("toggle region lock"));
+       begin_reversible_command (_("toggle region lock"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                (*i)->region()->clear_changes ();
@@ -5184,7 +5620,7 @@ Editor::toggle_region_lock ()
                _session->add_command (new StatefulDiffCommand ((*i)->region()));
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -5200,7 +5636,7 @@ Editor::toggle_region_video_lock ()
                return;
        }
 
-       _session->begin_reversible_command (_("Toggle Video Lock"));
+       begin_reversible_command (_("Toggle Video Lock"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                (*i)->region()->clear_changes ();
@@ -5208,7 +5644,7 @@ Editor::toggle_region_video_lock ()
                _session->add_command (new StatefulDiffCommand ((*i)->region()));
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -5224,7 +5660,7 @@ Editor::toggle_region_lock_style ()
                return;
        }
 
-       _session->begin_reversible_command (_("region lock style"));
+       begin_reversible_command (_("region lock style"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                (*i)->region()->clear_changes ();
@@ -5233,7 +5669,7 @@ Editor::toggle_region_lock_style ()
                _session->add_command (new StatefulDiffCommand ((*i)->region()));
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -5249,7 +5685,7 @@ Editor::toggle_opaque_region ()
                return;
        }
 
-       _session->begin_reversible_command (_("change region opacity"));
+       begin_reversible_command (_("change region opacity"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                (*i)->region()->clear_changes ();
@@ -5257,7 +5693,7 @@ Editor::toggle_opaque_region ()
                _session->add_command (new StatefulDiffCommand ((*i)->region()));
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -5273,11 +5709,11 @@ Editor::toggle_record_enable ()
                        continue;
 
                if (first) {
-                       new_state = !rtav->track()->record_enabled();
+                       new_state = !rtav->track()->rec_enable_control()->get_value();
                        first = false;
                }
 
-               rtav->track()->set_record_enabled (new_state, this);
+               rtav->track()->rec_enable_control()->set_value (new_state, Controllable::UseGroup);
        }
 }
 
@@ -5286,7 +5722,7 @@ Editor::toggle_solo ()
 {
        bool new_state = false;
        bool first = true;
-       boost::shared_ptr<RouteList> rl (new RouteList);
+       boost::shared_ptr<ControlList> cl (new ControlList);
 
        for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
                RouteTimeAxisView *rtav = dynamic_cast<RouteTimeAxisView *>(*i);
@@ -5300,10 +5736,10 @@ Editor::toggle_solo ()
                        first = false;
                }
 
-               rl->push_back (rtav->route());
+               cl->push_back (rtav->route()->solo_control());
        }
 
-       _session->set_solo (rl, new_state, Session::rt_cleanup, true);
+       _session->set_controls (cl, new_state ? 1.0 : 0.0, Controllable::UseGroup);
 }
 
 void
@@ -5328,7 +5764,7 @@ Editor::toggle_mute ()
                rl->push_back (rtav->route());
        }
 
-       _session->set_mute (rl, new_state, Session::rt_cleanup, true);
+       _session->set_controls (route_list_to_control_list (rl, &Stripable::mute_control), new_state, Controllable::UseGroup);
 }
 
 void
@@ -5390,13 +5826,13 @@ Editor::set_fade_length (bool in)
                cmd = _("set fade out length");
        }
 
-       begin_reversible_command (cmd);
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);
 
                if (!tmp) {
-                       return;
+                       continue;
                }
 
                boost::shared_ptr<AutomationList> alist;
@@ -5416,11 +5852,17 @@ Editor::set_fade_length (bool in)
                        tmp->audio_region()->set_fade_out_active (true);
                }
 
+               if (!in_command) {
+                       begin_reversible_command (cmd);
+                       in_command = true;
+               }
                XMLNode &after = alist->get_state();
                _session->add_command(new MementoCommand<AutomationList>(*alist, &before, &after));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5431,14 +5873,13 @@ Editor::set_fade_in_shape (FadeShape shape)
        if (rs.empty()) {
                return;
        }
-
-       begin_reversible_command (_("set fade in shape"));
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);
 
                if (!tmp) {
-                       return;
+                       continue;
                }
 
                boost::shared_ptr<AutomationList> alist = tmp->audio_region()->fade_in();
@@ -5446,12 +5887,17 @@ Editor::set_fade_in_shape (FadeShape shape)
 
                tmp->audio_region()->set_fade_in_shape (shape);
 
+               if (!in_command) {
+                       begin_reversible_command (_("set fade in shape"));
+                       in_command = true;
+               }
                XMLNode &after = alist->get_state();
                _session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &after));
        }
 
-       commit_reversible_command ();
-
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5462,14 +5908,13 @@ Editor::set_fade_out_shape (FadeShape shape)
        if (rs.empty()) {
                return;
        }
-
-       begin_reversible_command (_("set fade out shape"));
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);
 
                if (!tmp) {
-                       return;
+                       continue;
                }
 
                boost::shared_ptr<AutomationList> alist = tmp->audio_region()->fade_out();
@@ -5477,11 +5922,17 @@ Editor::set_fade_out_shape (FadeShape shape)
 
                tmp->audio_region()->set_fade_out_shape (shape);
 
+               if(!in_command) {
+                       begin_reversible_command (_("set fade out shape"));
+                       in_command = true;
+               }
                XMLNode &after = alist->get_state();
                _session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &after));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5492,14 +5943,13 @@ Editor::set_fade_in_active (bool yn)
        if (rs.empty()) {
                return;
        }
-
-       begin_reversible_command (_("set fade in active"));
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);
 
                if (!tmp) {
-                       return;
+                       continue;
                }
 
 
@@ -5507,10 +5957,17 @@ Editor::set_fade_in_active (bool yn)
 
                ar->clear_changes ();
                ar->set_fade_in_active (yn);
+
+               if (!in_command) {
+                       begin_reversible_command (_("set fade in active"));
+                       in_command = true;
+               }
                _session->add_command (new StatefulDiffCommand (ar));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5521,24 +5978,30 @@ Editor::set_fade_out_active (bool yn)
        if (rs.empty()) {
                return;
        }
-
-       begin_reversible_command (_("set fade out active"));
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);
 
                if (!tmp) {
-                       return;
+                       continue;
                }
 
                boost::shared_ptr<AudioRegion> ar (tmp->audio_region());
 
                ar->clear_changes ();
                ar->set_fade_out_active (yn);
+
+               if (!in_command) {
+                       begin_reversible_command (_("set fade out active"));
+                       in_command = true;
+               }
                _session->add_command(new StatefulDiffCommand (ar));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5547,7 +6010,7 @@ Editor::toggle_region_fades (int dir)
        if (_ignore_region_action) {
                return;
        }
-       
+
        boost::shared_ptr<AudioRegion> ar;
        bool yn = false;
 
@@ -5574,11 +6037,14 @@ Editor::toggle_region_fades (int dir)
        }
 
        /* XXX should this undo-able? */
+       bool in_command = false;
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                if ((ar = boost::dynamic_pointer_cast<AudioRegion>((*i)->region())) == 0) {
                        continue;
                }
+               ar->clear_changes ();
+
                if (dir == 1 || dir == 0) {
                        ar->set_fade_in_active (!yn);
                }
@@ -5586,6 +6052,15 @@ Editor::toggle_region_fades (int dir)
                if (dir == -1 || dir == 0) {
                        ar->set_fade_out_active (!yn);
                }
+               if (!in_command) {
+                       begin_reversible_command (_("toggle fade active"));
+                       in_command = true;
+               }
+               _session->add_command(new StatefulDiffCommand (ar));
+       }
+
+       if (in_command) {
+               commit_reversible_command ();
        }
 }
 
@@ -5655,34 +6130,42 @@ Editor::set_playhead_cursor ()
                }
        }
 
-       if ( Config->get_follow_edits() )
+       if (UIConfiguration::instance().get_follow_edits() && (!_session || !_session->config.get_external_sync())) {
                cancel_time_selection();
+       }
 }
 
 void
 Editor::split_region ()
 {
+       if (_drags->active ()) {
+               return;
+       }
+
+       //if a range is selected, separate it
        if ( !selection->time.empty()) {
                separate_regions_between (selection->time);
                return;
        }
 
-       RegionSelection rs = get_regions_from_selection_and_edit_point ();
+       //if no range was selected, try to find some regions to split
+       if (current_mouse_mode() == MouseObject) {  //don't try this for Internal Edit, Stretch, Draw, etc.
 
-       framepos_t where = get_preferred_edit_position ();
+               RegionSelection rs = get_regions_from_selection_and_edit_point ();
 
-       if (rs.empty()) {
-               return;
-       }
+               framepos_t where = get_preferred_edit_position ();
 
-       split_regions_at (where, rs);
-}
+               if (rs.empty()) {
+                       return;
+               }
 
-struct EditorOrderRouteSorter {
-    bool operator() (boost::shared_ptr<Route> a, boost::shared_ptr<Route> b) {
-           return a->order_key () < b->order_key ();
-    }
-};
+               if (snap_musical()) {
+                       split_regions_at (where, rs, get_grid_music_divisions (0));
+               } else {
+                       split_regions_at (where, rs, 0);
+               }
+       }
+}
 
 void
 Editor::select_next_route()
@@ -5697,6 +6180,7 @@ Editor::select_next_route()
        RouteUI *rui;
        do {
                for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
+
                        if (*i == current) {
                                ++i;
                                if (i != track_views.end()) {
@@ -5708,10 +6192,12 @@ Editor::select_next_route()
                                break;
                        }
                }
+
                rui = dynamic_cast<RouteUI *>(current);
-       } while ( current->hidden() || (rui != NULL && !rui->route()->active()));
 
-       selection->set(current);
+       } while (current->hidden() || (rui == NULL) || !rui->route()->active());
+
+       selection->set (current);
 
        ensure_time_axis_view_is_visible (*current, false);
 }
@@ -5729,6 +6215,7 @@ Editor::select_prev_route()
        RouteUI *rui;
        do {
                for (TrackViewList::reverse_iterator i = track_views.rbegin(); i != track_views.rend(); ++i) {
+
                        if (*i == current) {
                                ++i;
                                if (i != track_views.rend()) {
@@ -5740,7 +6227,8 @@ Editor::select_prev_route()
                        }
                }
                rui = dynamic_cast<RouteUI *>(current);
-       } while ( current->hidden() || (rui != NULL && !rui->route()->active()));
+
+       } while (current->hidden() || (rui == NULL) || !rui->route()->active());
 
        selection->set (current);
 
@@ -5750,15 +6238,30 @@ Editor::select_prev_route()
 void
 Editor::set_loop_from_selection (bool play)
 {
-       if (_session == 0 || selection->time.empty()) {
+       if (_session == 0) {
                return;
        }
 
-       framepos_t start = selection->time[clicked_selection].start;
-       framepos_t end = selection->time[clicked_selection].end;
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
+               return;
 
        set_loop_range (start, end,  _("set loop range from selection"));
 
+       if (play) {
+               _session->request_play_loop (true, true);
+       }
+}
+
+void
+Editor::set_loop_from_region (bool play)
+{
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
+               return;
+
+       set_loop_range (start, end, _("set loop range from region"));
+
        if (play) {
                _session->request_locate (start, true);
                _session->request_play_loop (true);
@@ -5766,106 +6269,177 @@ Editor::set_loop_from_selection (bool play)
 }
 
 void
-Editor::set_loop_from_edit_range (bool play)
+Editor::set_punch_from_selection ()
 {
        if (_session == 0) {
                return;
        }
 
-       framepos_t start;
-       framepos_t end;
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
+               return;
+
+       set_punch_range (start, end,  _("set punch range from selection"));
+}
 
-       if (!get_edit_op_range (start, end)) {
+void
+Editor::set_session_extents_from_selection ()
+{
+       if (_session == 0) {
                return;
        }
 
-       set_loop_range (start, end,  _("set loop range from edit range"));
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
+               return;
+
+       Location* loc;
+       if ((loc = _session->locations()->session_range_location()) == 0) {
+               _session->set_session_extents (start, end);  // this will create a new session range;  no need for UNDO
+       } else {
+               XMLNode &before = loc->get_state();
+
+               _session->set_session_extents (start, end);
+
+               XMLNode &after = loc->get_state();
+
+               begin_reversible_command (_("set session start/end from selection"));
+
+               _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
+
+               commit_reversible_command ();
+       }
+
+       _session->set_end_is_free (false);
+}
+
+void
+Editor::set_punch_start_from_edit_point ()
+{
+       if (_session) {
+
+               framepos_t start = 0;
+               framepos_t end = max_framepos;
+
+               //use the existing punch end, if any
+               Location* tpl = transport_punch_location();
+               if (tpl) {
+                       end = tpl->end();
+               }
+
+               if ((_edit_point == EditAtPlayhead) && _session->transport_rolling()) {
+                       start = _session->audible_frame();
+               } else {
+                       start = get_preferred_edit_position();
+               }
+
+               //snap the selection start/end
+               snap_to(start);
+
+               //if there's not already a sensible selection endpoint, go "forever"
+               if ( start > end ) {
+                       end = max_framepos;
+               }
 
-       if (play) {
-               _session->request_locate (start, true);
-               _session->request_play_loop (true);
+               set_punch_range (start, end, _("set punch start from EP"));
        }
+
 }
 
 void
-Editor::set_loop_from_region (bool play)
+Editor::set_punch_end_from_edit_point ()
 {
-       framepos_t start = max_framepos;
-       framepos_t end = 0;
-
-       RegionSelection rs = get_regions_from_selection_and_entered ();
+       if (_session) {
 
-       if (rs.empty()) {
-               return;
-       }
+               framepos_t start = 0;
+               framepos_t end = max_framepos;
 
-       for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
-               if ((*i)->region()->position() < start) {
-                       start = (*i)->region()->position();
+               //use the existing punch start, if any
+               Location* tpl = transport_punch_location();
+               if (tpl) {
+                       start = tpl->start();
                }
-               if ((*i)->region()->last_frame() + 1 > end) {
-                       end = (*i)->region()->last_frame() + 1;
+
+               if ((_edit_point == EditAtPlayhead) && _session->transport_rolling()) {
+                       end = _session->audible_frame();
+               } else {
+                       end = get_preferred_edit_position();
                }
-       }
 
-       set_loop_range (start, end, _("set loop range from region"));
+               //snap the selection start/end
+               snap_to(end);
+
+               set_punch_range (start, end, _("set punch end from EP"));
 
-       if (play) {
-               _session->request_locate (start, true);
-               _session->request_play_loop (true);
        }
 }
 
 void
-Editor::set_punch_from_selection ()
+Editor::set_loop_start_from_edit_point ()
 {
-       if (_session == 0 || selection->time.empty()) {
-               return;
-       }
+       if (_session) {
 
-       framepos_t start = selection->time[clicked_selection].start;
-       framepos_t end = selection->time[clicked_selection].end;
+               framepos_t start = 0;
+               framepos_t end = max_framepos;
 
-       set_punch_range (start, end,  _("set punch range from selection"));
-}
+               //use the existing loop end, if any
+               Location* tpl = transport_loop_location();
+               if (tpl) {
+                       end = tpl->end();
+               }
 
-void
-Editor::set_punch_from_edit_range ()
-{
-       if (_session == 0) {
-               return;
-       }
+               if ((_edit_point == EditAtPlayhead) && _session->transport_rolling()) {
+                       start = _session->audible_frame();
+               } else {
+                       start = get_preferred_edit_position();
+               }
 
-       framepos_t start;
-       framepos_t end;
+               //snap the selection start/end
+               snap_to(start);
 
-       if (!get_edit_op_range (start, end)) {
-               return;
+               //if there's not already a sensible selection endpoint, go "forever"
+               if ( start > end ) {
+                       end = max_framepos;
+               }
+
+               set_loop_range (start, end, _("set loop start from EP"));
        }
 
-       set_punch_range (start, end,  _("set punch range from edit range"));
 }
 
 void
-Editor::set_punch_from_region ()
+Editor::set_loop_end_from_edit_point ()
 {
-       framepos_t start = max_framepos;
-       framepos_t end = 0;
-
-       RegionSelection rs = get_regions_from_selection_and_entered ();
+       if (_session) {
 
-       if (rs.empty()) {
-               return;
-       }
+               framepos_t start = 0;
+               framepos_t end = max_framepos;
 
-       for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
-               if ((*i)->region()->position() < start) {
-                       start = (*i)->region()->position();
+               //use the existing loop start, if any
+               Location* tpl = transport_loop_location();
+               if (tpl) {
+                       start = tpl->start();
                }
-               if ((*i)->region()->last_frame() + 1 > end) {
-                       end = (*i)->region()->last_frame() + 1;
+
+               if ((_edit_point == EditAtPlayhead) && _session->transport_rolling()) {
+                       end = _session->audible_frame();
+               } else {
+                       end = get_preferred_edit_position();
                }
+
+               //snap the selection start/end
+               snap_to(end);
+
+               set_loop_range (start, end, _("set loop end from EP"));
        }
+}
+
+void
+Editor::set_punch_from_region ()
+{
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
+               return;
 
        set_punch_range (start, end, _("set punch range from region"));
 }
@@ -5889,30 +6463,6 @@ Editor::pitch_shift_region ()
        pitch_shift (audio_rs, 1.2);
 }
 
-void
-Editor::transpose_region ()
-{
-       RegionSelection rs = get_regions_from_selection_and_entered ();
-
-       list<MidiRegionView*> midi_region_views;
-       for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
-               MidiRegionView* mrv = dynamic_cast<MidiRegionView*> (*i);
-               if (mrv) {
-                       midi_region_views.push_back (mrv);
-               }
-       }
-
-       TransposeDialog d;
-       int const r = d.run ();
-       if (r != RESPONSE_ACCEPT) {
-               return;
-       }
-
-       for (list<MidiRegionView*>::iterator i = midi_region_views.begin(); i != midi_region_views.end(); ++i) {
-               (*i)->midi_region()->transpose (d.semitones ());
-       }
-}
-
 void
 Editor::set_tempo_from_region ()
 {
@@ -5941,11 +6491,13 @@ Editor::define_one_bar (framepos_t start, framepos_t end)
 {
        framepos_t length = end - start;
 
-       const Meter& m (_session->tempo_map().meter_at (start));
+       const Meter& m (_session->tempo_map().meter_at_frame (start));
 
        /* length = 1 bar */
 
-       /* now we want frames per beat.
+       /* We're going to deliver a constant tempo here,
+          so we can use frames per beat to determine length.
+          now we want frames per beat.
           we have frames per bar, and beats per bar, so ...
        */
 
@@ -5964,7 +6516,7 @@ Editor::define_one_bar (framepos_t start, framepos_t end)
 
        */
 
-       const TempoSection& t (_session->tempo_map().tempo_section_at (start));
+       const TempoSection& t (_session->tempo_map().tempo_section_at_frame (start));
 
        bool do_global = false;
 
@@ -6015,9 +6567,8 @@ Editor::define_one_bar (framepos_t start, framepos_t end)
        } else if (t.frame() == start) {
                _session->tempo_map().change_existing_tempo_at (start, beats_per_minute, t.note_type());
        } else {
-               Timecode::BBT_Time bbt;
-               _session->tempo_map().bbt_time (start, bbt);
-               _session->tempo_map().add_tempo (Tempo (beats_per_minute, t.note_type()), bbt);
+               const Tempo tempo (beats_per_minute, t.note_type());
+               _session->tempo_map().add_tempo (tempo, 0.0, start, TempoSection::Constant, AudioTime);
        }
 
        XMLNode& after (_session->tempo_map().get_state());
@@ -6037,7 +6588,7 @@ Editor::split_region_at_transients ()
                return;
        }
 
-       _session->begin_reversible_command (_("split regions"));
+       begin_reversible_command (_("split regions"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ) {
 
@@ -6048,7 +6599,8 @@ Editor::split_region_at_transients ()
 
                boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion> ((*i)->region());
 
-               if (ar && (ar->get_transients (positions) == 0)) {
+               if (ar) {
+                       ar->transients (positions);
                        split_region_at_points ((*i)->region(), positions, true);
                        positions.clear ();
                }
@@ -6056,7 +6608,7 @@ Editor::split_region_at_transients ()
                i = tmp;
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 
 }
 
@@ -6077,7 +6629,6 @@ Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList
                return;
        }
 
-
        if (positions.size() > 20 && can_ferret) {
                std::string msgstr = string_compose (_("You are about to split\n%1\ninto %2 pieces.\nThis could take a long time."), r->name(), positions.size() + 1);
                MessageDialog msg (msgstr,
@@ -6130,27 +6681,28 @@ Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList
 
        framepos_t pos = 0;
 
+       framepos_t rstart = r->first_frame ();
+       framepos_t rend = r->last_frame ();
+
        while (x != positions.end()) {
 
                /* deal with positons that are out of scope of present region bounds */
-               if (*x <= 0 || *x > r->length()) {
+               if (*x <= rstart || *x > rend) {
                        ++x;
                        continue;
                }
 
-               /* file start = original start + how far we from the initial position ?
-                */
+               /* file start = original start + how far we from the initial position ?  */
 
                framepos_t file_start = r->start() + pos;
 
-               /* length = next position - current position
-                */
+               /* length = next position - current position */
 
-               framepos_t len = (*x) - pos;
+               framepos_t len = (*x) - pos - rstart;
 
                /* XXX we do we really want to allow even single-sample regions?
-                  shouldn't we have some kind of lower limit on region size?
-               */
+                * shouldn't we have some kind of lower limit on region size?
+                */
 
                if (len <= 0) {
                        break;
@@ -6170,14 +6722,15 @@ Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList
                plist.add (ARDOUR::Properties::length, len);
                plist.add (ARDOUR::Properties::name, new_name);
                plist.add (ARDOUR::Properties::layer, 0);
+               // TODO set transients_offset
 
                boost::shared_ptr<Region> nr = RegionFactory::create (r->sources(), plist, false);
                /* because we set annouce to false, manually add the new region to the
-                  RegionFactory map
-               */
+                * RegionFactory map
+                */
                RegionFactory::map_add (nr);
 
-               pl->add_region (nr, r->position() + pos);
+               pl->add_region (nr, rstart + pos);
 
                if (select_new) {
                        new_regions.push_front(nr);
@@ -6218,7 +6771,7 @@ Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList
        vector<Command*> cmds;
        pl->rdiff (cmds);
        _session->add_commands (cmds);
-       
+
        _session->add_command (new StatefulDiffCommand (pl));
 
        if (select_new) {
@@ -6244,14 +6797,13 @@ Editor::place_transient()
 
        framepos_t where = get_preferred_edit_position();
 
-       _session->begin_reversible_command (_("place transient"));
+       begin_reversible_command (_("place transient"));
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
-               framepos_t position = (*r)->region()->position();
-               (*r)->region()->add_transient(where - position);
+               (*r)->region()->add_transient(where);
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -6279,7 +6831,7 @@ Editor::snap_regions_to_grid ()
                return;
        }
 
-       _session->begin_reversible_command (_("snap regions to grid"));
+       begin_reversible_command (_("snap regions to grid"));
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
 
@@ -6304,7 +6856,7 @@ Editor::snap_regions_to_grid ()
                used_playlists.pop_front();
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -6362,7 +6914,7 @@ Editor::close_region_gaps ()
 
        /* Iterate over the region list and make adjacent regions overlap by crossfade_len_ms */
 
-       _session->begin_reversible_command (_("close region gaps"));
+       begin_reversible_command (_("close region gaps"));
 
        int idx = 0;
        boost::shared_ptr<Region> last_region;
@@ -6403,7 +6955,7 @@ Editor::close_region_gaps ()
                used_playlists.pop_front();
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -6492,7 +7044,7 @@ Editor::playhead_forward_to_grid ()
        if (!_session) {
                return;
        }
-       
+
        framepos_t pos = playhead_cursor->current_frame ();
        if (pos < max_framepos - 1) {
                pos += 2;
@@ -6508,7 +7060,7 @@ Editor::playhead_backward_to_grid ()
        if (!_session) {
                return;
        }
-       
+
        framepos_t pos = playhead_cursor->current_frame ();
        if (pos > 2) {
                pos -= 2;
@@ -6553,6 +7105,24 @@ Editor::toggle_tracks_active ()
 
 void
 Editor::remove_tracks ()
+{
+       /* this will delete GUI objects that may be the subject of an event
+          handler in which this method is called. Defer actual deletion to the
+          next idle callback, when all event handling is finished.
+       */
+       Glib::signal_idle().connect (sigc::mem_fun (*this, &Editor::idle_remove_tracks));
+}
+
+bool
+Editor::idle_remove_tracks ()
+{
+       Session::StateProtector sp (_session);
+       _remove_tracks ();
+       return false; /* do not call again */
+}
+
+void
+Editor::_remove_tracks ()
 {
        TrackSelection& ts (selection->tracks);
 
@@ -6608,18 +7178,8 @@ edit your ardour.rc file to set the\n\
                return;
        }
 
-       // XXX should be using gettext plural forms, maybe?
-       if (ntracks > 1) {
-               trackstr = _("tracks");
-       } else {
-               trackstr = _("track");
-       }
-
-       if (nbusses > 1) {
-               busstr = _("busses");
-       } else {
-               busstr = _("bus");
-       }
+       trackstr = P_("track", "tracks", ntracks);
+       busstr = P_("bus", "busses", nbusses);
 
        if (ntracks) {
                if (nbusses) {
@@ -6660,12 +7220,17 @@ edit your ardour.rc file to set the\n\
        }
 
        {
-               Session::StateProtector sp (_session);
                DisplaySuspender ds;
+               boost::shared_ptr<RouteList> rl (new RouteList);
                for (vector<boost::shared_ptr<Route> >::iterator x = routes.begin(); x != routes.end(); ++x) {
-                       _session->remove_route (*x);
+                       rl->push_back (*x);
                }
+               _session->remove_routes (rl);
        }
+       /* TrackSelection and RouteList leave scope,
+        * destructors are called,
+        * diskstream drops references, save_state is called (again for every track)
+        */
 }
 
 void
@@ -6675,7 +7240,7 @@ Editor::do_insert_time ()
                return;
        }
 
-       InsertTimeDialog d (*this);
+       InsertRemoveTimeDialog d (*this);
        int response = d.run ();
 
        if (response != RESPONSE_OK) {
@@ -6686,12 +7251,10 @@ Editor::do_insert_time ()
                return;
        }
 
-       InsertTimeOption opt = d.intersected_region_action ();
-
        insert_time (
-               get_preferred_edit_position(),
+               get_preferred_edit_position (EDIT_IGNORE_MOUSE),
                d.distance(),
-               opt,
+               d.intersected_region_action (),
                d.all_playlists(),
                d.move_glued(),
                d.move_markers(),
@@ -6707,13 +7270,11 @@ Editor::insert_time (
        bool all_playlists, bool ignore_music_glue, bool markers_too, bool glued_markers_too, bool locked_markers_too, bool tempo_too
        )
 {
-       bool commit = false;
 
        if (Config->get_edit_mode() == Lock) {
                return;
        }
-
-       begin_reversible_command (_("insert time"));
+       bool in_command = false;
 
        TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
 
@@ -6730,7 +7291,7 @@ Editor::insert_time (
 
                if (all_playlists) {
                        RouteTimeAxisView* rtav = dynamic_cast<RouteTimeAxisView*> (*x);
-                       if (rtav) {
+                       if (rtav && rtav->track ()) {
                                vector<boost::shared_ptr<Playlist> > all = _session->playlists->playlists_for_track (rtav->track ());
                                for (vector<boost::shared_ptr<Playlist> >::iterator p = all.begin(); p != all.end(); ++p) {
                                        pl.insert (*p);
@@ -6741,31 +7302,38 @@ Editor::insert_time (
                                pl.insert ((*x)->playlist ());
                        }
                }
-               
+
                for (set<boost::shared_ptr<Playlist> >::iterator i = pl.begin(); i != pl.end(); ++i) {
 
                        (*i)->clear_changes ();
                        (*i)->clear_owned_changes ();
 
                        if (opt == SplitIntersected) {
-                               (*i)->split (pos);
+                               /* non musical split */
+                               (*i)->split (pos, 0);
                        }
 
                        (*i)->shift (pos, frames, (opt == MoveIntersected), ignore_music_glue);
 
+                       if (!in_command) {
+                               begin_reversible_command (_("insert time"));
+                               in_command = true;
+                       }
                        vector<Command*> cmds;
                        (*i)->rdiff (cmds);
                        _session->add_commands (cmds);
 
                        _session->add_command (new StatefulDiffCommand (*i));
-                       commit = true;
                }
 
                /* automation */
                RouteTimeAxisView* rtav = dynamic_cast<RouteTimeAxisView*> (*x);
                if (rtav) {
+                       if (!in_command) {
+                               begin_reversible_command (_("insert time"));
+                               in_command = true;
+                       }
                        rtav->route ()->shift (pos, frames);
-                       commit = true;
                }
        }
 
@@ -6779,45 +7347,225 @@ Editor::insert_time (
 
                        Locations::LocationList::const_iterator tmp;
 
-                       bool const was_locked = (*i)->locked ();
-                       if (locked_markers_too) {
-                               (*i)->unlock ();
-                       }
-
                        if ((*i)->position_lock_style() == AudioTime || glued_markers_too) {
+                               bool const was_locked = (*i)->locked ();
+                               if (locked_markers_too) {
+                                       (*i)->unlock ();
+                               }
 
                                if ((*i)->start() >= pos) {
-                                       (*i)->set_start ((*i)->start() + frames);
+                                       // move end first, in case we're moving by more than the length of the range
                                        if (!(*i)->is_mark()) {
                                                (*i)->set_end ((*i)->end() + frames);
                                        }
+                                       (*i)->set_start ((*i)->start() + frames);
                                        moved = true;
                                }
 
+                               if (was_locked) {
+                                       (*i)->lock ();
+                               }
+                       }
+               }
+
+               if (moved) {
+                       if (!in_command) {
+                               begin_reversible_command (_("insert time"));
+                               in_command = true;
+                       }
+                       XMLNode& after (_session->locations()->get_state());
+                       _session->add_command (new MementoCommand<Locations>(*_session->locations(), &before, &after));
+               }
+       }
+
+       if (tempo_too) {
+               if (!in_command) {
+                       begin_reversible_command (_("insert time"));
+                       in_command = true;
+               }
+               XMLNode& before (_session->tempo_map().get_state());
+               _session->tempo_map().insert_time (pos, frames);
+               XMLNode& after (_session->tempo_map().get_state());
+               _session->add_command (new MementoCommand<TempoMap>(_session->tempo_map(), &before, &after));
+       }
+
+       if (in_command) {
+               commit_reversible_command ();
+       }
+}
+
+void
+Editor::do_remove_time ()
+{
+       if (selection->tracks.empty()) {
+               return;
+       }
+
+       framepos_t pos = get_preferred_edit_position (EDIT_IGNORE_MOUSE);
+       InsertRemoveTimeDialog d (*this, true);
+
+       int response = d.run ();
+
+       if (response != RESPONSE_OK) {
+               return;
+       }
+
+       framecnt_t distance = d.distance();
+
+       if (distance == 0) {
+               return;
+       }
+
+       remove_time (
+               pos,
+               distance,
+               SplitIntersected,
+               d.move_glued(),
+               d.move_markers(),
+               d.move_glued_markers(),
+               d.move_locked_markers(),
+               d.move_tempos()
+       );
+}
+
+void
+Editor::remove_time (framepos_t pos, framecnt_t frames, InsertTimeOption opt,
+                    bool ignore_music_glue, bool markers_too, bool glued_markers_too, bool locked_markers_too, bool tempo_too)
+{
+       if (Config->get_edit_mode() == Lock) {
+               error << (_("Cannot insert or delete time when in Lock edit.")) << endmsg;
+               return;
+       }
+       bool in_command = false;
+
+       for (TrackSelection::iterator x = selection->tracks.begin(); x != selection->tracks.end(); ++x) {
+               /* regions */
+               boost::shared_ptr<Playlist> pl = (*x)->playlist();
+
+               if (pl) {
+
+                       XMLNode &before = pl->get_state();
+
+                       std::list<AudioRange> rl;
+                       AudioRange ar(pos, pos+frames, 0);
+                       rl.push_back(ar);
+                       pl->cut (rl);
+                       pl->shift (pos, -frames, true, ignore_music_glue);
+
+                       if (!in_command) {
+                               begin_reversible_command (_("remove time"));
+                               in_command = true;
+                       }
+                       XMLNode &after = pl->get_state();
+
+                       _session->add_command (new MementoCommand<Playlist> (*pl, &before, &after));
+               }
+
+               /* automation */
+               RouteTimeAxisView* rtav = dynamic_cast<RouteTimeAxisView*> (*x);
+               if (rtav) {
+                       if (!in_command) {
+                               begin_reversible_command (_("remove time"));
+                               in_command = true;
                        }
+                       rtav->route ()->shift (pos, -frames);
+               }
+       }
+
+       std::list<Location*> loc_kill_list;
+
+       /* markers */
+       if (markers_too) {
+               bool moved = false;
+               XMLNode& before (_session->locations()->get_state());
+               Locations::LocationList copy (_session->locations()->list());
+
+               for (Locations::LocationList::iterator i = copy.begin(); i != copy.end(); ++i) {
+                       if ((*i)->position_lock_style() == AudioTime || glued_markers_too) {
+
+                               bool const was_locked = (*i)->locked ();
+                               if (locked_markers_too) {
+                                       (*i)->unlock ();
+                               }
+
+                               if (!(*i)->is_mark()) {  // it's a range;  have to handle both start and end
+                                       if ((*i)->end() >= pos
+                                       && (*i)->end() < pos+frames
+                                       && (*i)->start() >= pos
+                                       && (*i)->end() < pos+frames) {  // range is completely enclosed;  kill it
+                                               moved = true;
+                                               loc_kill_list.push_back(*i);
+                                       } else {  // only start or end is included, try to do the right thing
+                                               // move start before moving end, to avoid trying to move the end to before the start
+                                               // if we're removing more time than the length of the range
+                                               if ((*i)->start() >= pos && (*i)->start() < pos+frames) {
+                                                       // start is within cut
+                                                       (*i)->set_start (pos);  // bring the start marker to the beginning of the cut
+                                                       moved = true;
+                                               } else if ((*i)->start() >= pos+frames) {
+                                                       // start (and thus entire range) lies beyond end of cut
+                                                       (*i)->set_start ((*i)->start() - frames); // slip the start marker back
+                                                       moved = true;
+                                               }
+                                               if ((*i)->end() >= pos && (*i)->end() < pos+frames) {
+                                                       // end is inside cut
+                                                       (*i)->set_end (pos);  // bring the end to the cut
+                                                       moved = true;
+                                               } else if ((*i)->end() >= pos+frames) {
+                                                       // end is beyond end of cut
+                                                       (*i)->set_end ((*i)->end() - frames); // slip the end marker back
+                                                       moved = true;
+                                               }
+
+                                       }
+                               } else if ((*i)->start() >= pos && (*i)->start() < pos+frames ) {
+                                       loc_kill_list.push_back(*i);
+                                       moved = true;
+                               } else if ((*i)->start() >= pos) {
+                                       (*i)->set_start ((*i)->start() -frames);
+                                       moved = true;
+                               }
 
-                       if (was_locked) {
-                               (*i)->lock ();
+                               if (was_locked) {
+                                       (*i)->lock ();
+                               }
                        }
                }
 
+               for (list<Location*>::iterator i = loc_kill_list.begin(); i != loc_kill_list.end(); ++i) {
+                       _session->locations()->remove( *i );
+               }
+
                if (moved) {
+                       if (!in_command) {
+                               begin_reversible_command (_("remove time"));
+                               in_command = true;
+                       }
                        XMLNode& after (_session->locations()->get_state());
                        _session->add_command (new MementoCommand<Locations>(*_session->locations(), &before, &after));
                }
        }
 
        if (tempo_too) {
-               _session->tempo_map().insert_time (pos, frames);
+               XMLNode& before (_session->tempo_map().get_state());
+
+               if (_session->tempo_map().remove_time (pos, frames) ) {
+                       if (!in_command) {
+                               begin_reversible_command (_("remove time"));
+                               in_command = true;
+                       }
+                       XMLNode& after (_session->tempo_map().get_state());
+                       _session->add_command (new MementoCommand<TempoMap>(_session->tempo_map(), &before, &after));
+               }
        }
 
-       if (commit) {
+       if (in_command) {
                commit_reversible_command ();
        }
 }
 
 void
-Editor::fit_selected_tracks ()
+Editor::fit_selection ()
 {
         if (!selection->tracks.empty()) {
                 fit_tracks (selection->tracks);
@@ -6869,21 +7617,21 @@ Editor::fit_tracks (TrackViewList & tracks)
 
        /* compute the per-track height from:
 
-          total canvas visible height - 
+          total canvas visible height -
                  height that will be taken by visible children of selected
-                 tracks - height of the ruler/hscroll area 
+                 tracks - height of the ruler/hscroll area
        */
        uint32_t h = (uint32_t) floor ((trackviews_height() - child_heights) / visible_tracks);
        double first_y_pos = DBL_MAX;
 
        if (h < TimeAxisView::preset_height (HeightSmall)) {
-               MessageDialog msg (*this, _("There are too many tracks to fit in the current window"));
+               MessageDialog msg (_("There are too many tracks to fit in the current window"));
                /* too small to be displayed */
                return;
        }
 
        undo_visual_stack.push_back (current_visual_state (true));
-       no_save_visual = true;
+       PBD::Unwinder<bool> nsv (no_save_visual, true);
 
        /* build a list of all tracks, including children */
 
@@ -6896,36 +7644,36 @@ Editor::fit_tracks (TrackViewList & tracks)
                }
        }
 
-       bool prev_was_selected = false;
-       bool is_selected = tracks.contains (all.front());
-       bool next_is_selected;
-
-       for (TrackViewList::iterator t = all.begin(); t != all.end(); ++t) {
-
-               TrackViewList::iterator next;
-
-               next = t;
-               ++next;
 
-               if (next != all.end()) {
-                       next_is_selected = tracks.contains (*next);
-               } else {
-                       next_is_selected = false;
+       // find selection range.
+       // if someone knows how to user TrackViewList::iterator for this
+       // I'm all ears.
+       int selected_top = -1;
+       int selected_bottom = -1;
+       int i = 0;
+       for (TrackViewList::iterator t = all.begin(); t != all.end(); ++t, ++i) {
+               if ((*t)->marked_for_display ()) {
+                       if (tracks.contains(*t)) {
+                               if (selected_top == -1) {
+                                       selected_top = i;
+                               }
+                               selected_bottom = i;
+                       }
                }
+       }
 
+       i = 0;
+       for (TrackViewList::iterator t = all.begin(); t != all.end(); ++t, ++i) {
                if ((*t)->marked_for_display ()) {
-                       if (is_selected) {
+                       if (tracks.contains(*t)) {
                                (*t)->set_height (h);
                                first_y_pos = std::min ((*t)->y_position (), first_y_pos);
                        } else {
-                               if (prev_was_selected && next_is_selected) {
+                               if (i > selected_top && i < selected_bottom) {
                                        hide_track_in_display (*t);
                                }
                        }
                }
-
-               prev_was_selected = is_selected;
-               is_selected = next_is_selected;
        }
 
        /*
@@ -6974,7 +7722,7 @@ void
 Editor::start_visual_state_op (uint32_t n)
 {
        save_visual_state (n);
-       
+
        PopUp* pup = new PopUp (WIN_POS_MOUSE, 1000, true);
        char buf[32];
        snprintf (buf, sizeof (buf), _("Saved view %u"), n+1);
@@ -7011,7 +7759,7 @@ Editor::toggle_region_mute ()
 
                (*i)->region()->playlist()->clear_changes ();
                (*i)->region()->set_muted (!(*i)->region()->muted ());
-               _session->add_command (new StatefulDiffCommand ((*i)->region()->playlist()));
+               _session->add_command (new StatefulDiffCommand ((*i)->region()));
 
        }
 
@@ -7108,7 +7856,7 @@ Editor::toggle_midi_input_active (bool flip_others)
                        onoff = !mt->input_active();
                }
        }
-       
+
        _session->set_exclusive_input_active (rl, onoff, flip_others);
 }
 
@@ -7126,19 +7874,14 @@ Editor::lock ()
                b->set_text (_("Click to unlock"));
                b->signal_clicked.connect (sigc::mem_fun (*this, &Editor::unlock));
                lock_dialog->get_vbox()->pack_start (*b);
-               
+
                lock_dialog->get_vbox()->show_all ();
                lock_dialog->set_size_request (200, 200);
        }
-       
-#ifdef __APPLE__
-       /* The global menu bar continues to be accessible to applications
-          with modal dialogs, which means that we need to desensitize
-          all items in the menu bar. Since those items are really just
-          proxies for actions, that means disabling all actions.
-       */
-       ActionManager::disable_all_actions ();
-#endif
+
+       delete _main_menu_disabler;
+       _main_menu_disabler = new MainMenuDisabler;
+
        lock_dialog->present ();
 }
 
@@ -7146,12 +7889,11 @@ void
 Editor::unlock ()
 {
        lock_dialog->hide ();
-       
-#ifdef __APPLE__
-       ActionManager::pop_action_state ();
-#endif 
 
-       if (ARDOUR_UI::config()->get_lock_gui_after_seconds()) {
+       delete _main_menu_disabler;
+       _main_menu_disabler = 0;
+
+       if (UIConfiguration::instance().get_lock_gui_after_seconds()) {
                start_lock_event_timing ();
        }
 }
@@ -7165,6 +7907,7 @@ Editor::bring_in_callback (Gtk::Label* label, uint32_t n, uint32_t total, string
 void
 Editor::update_bring_in_message (Gtk::Label* label, uint32_t n, uint32_t total, string name)
 {
+       Timers::TimerSuspender t;
        label->set_text (string_compose ("Copying %1, %2 of %3", name, n, total));
        Gtkmm2ext::UI::instance()->flush_pending ();
 }
@@ -7180,11 +7923,12 @@ Editor::bring_all_sources_into_session ()
        ArdourDialog w (_("Moving embedded files into session folder"));
        w.get_vbox()->pack_start (msg);
        w.present ();
-       
+
        /* flush all pending GUI events because we're about to start copying
         * files
         */
-       
+
+       Timers::TimerSuspender t;
        Gtkmm2ext::UI::instance()->flush_pending ();
 
        cerr << " Do it\n";