Fix crash when setting loop or punch range after creating a new session (and probably...
[ardour.git] / gtk2_ardour / editor_ops.cc
index c9a5870df08f99985a707729941208ece596e531..1ca4c1d2455d71c3ae1927fd04aafcb21b21954b 100644 (file)
@@ -44,7 +44,6 @@
 #include "ardour/audio_diskstream.h"
 #include "ardour/utils.h"
 #include "ardour/location.h"
-#include "ardour/named_selection.h"
 #include "ardour/audio_track.h"
 #include "ardour/audioplaylist.h"
 #include "ardour/region_factory.h"
 using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
-using namespace sigc;
 using namespace Gtk;
 using namespace Gtkmm2ext;
 using namespace Editing;
+using Gtkmm2ext::Keyboard;
 
 /***********************************************************************
   Editor operations
@@ -97,16 +96,16 @@ using namespace Editing;
 void
 Editor::undo (uint32_t n)
 {
-       if (session) {
-               session->undo (n);
+       if (_session) {
+               _session->undo (n);
        }
 }
 
 void
 Editor::redo (uint32_t n)
 {
-       if (session) {
-               session->redo (n);
+       if (_session) {
+               _session->redo (n);
        }
 }
 
@@ -172,7 +171,7 @@ Editor::split_regions_at (nframes64_t where, RegionSelection& regions)
                        XMLNode &before = pl->get_state();
                        pl->split_region ((*a)->region(), where);
                        XMLNode &after = pl->get_state();
-                       session->add_command(new MementoCommand<Playlist>(*pl, &before, &after));
+                       _session->add_command(new MementoCommand<Playlist>(*pl, &before, &after));
                }
 
                a = tmp;
@@ -248,14 +247,8 @@ Editor::extend_selection_to_end_of_region (bool next)
                start = selection->time.start ();
        }
 
-       /* Try to leave the selection with the same route if possible */
-
-       if ((tv = selection->time.track) == 0) {
-               return;
-       }
-
        begin_reversible_command (_("extend selection"));
-       selection->set (tv, start, region->position() + region->length());
+       selection->set (start, region->position() + region->length());
        commit_reversible_command ();
 }
 
@@ -278,12 +271,8 @@ Editor::extend_selection_to_start_of_region (bool previous)
 
        /* Try to leave the selection with the same route if possible */
 
-       if ((tv = selection->time.track) == 0) {
-               return;
-       }
-
        begin_reversible_command (_("extend selection"));
-       selection->set (tv, region->position(), end);
+       selection->set (region->position(), end);
        commit_reversible_command ();
 }
 
@@ -319,7 +308,7 @@ Editor::nudge_forward (bool next, bool force_playhead)
 
        get_regions_for_action (rs);
 
-       if (!session) return;
+       if (!_session) return;
 
        if (!force_playhead && !rs.empty()) {
 
@@ -337,7 +326,7 @@ Editor::nudge_forward (bool next, bool force_playhead)
                         XMLNode &before = r->playlist()->get_state();
                        r->set_position (r->position() + distance, this);
                         XMLNode &after = r->playlist()->get_state();
-                       session->add_command (new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
+                       _session->add_command (new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
                }
 
                commit_reversible_command ();
@@ -379,7 +368,7 @@ Editor::nudge_forward (bool next, bool force_playhead)
                                        }
                                }
                                XMLNode& after (loc->get_state());
-                               session->add_command (new MementoCommand<Location>(*loc, &before, &after));
+                               _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
                        }
                }
 
@@ -387,7 +376,7 @@ Editor::nudge_forward (bool next, bool force_playhead)
 
        } else {
                distance = get_nudge_distance (playhead_cursor->current_frame, next_distance);
-               session->request_locate (playhead_cursor->current_frame + distance);
+               _session->request_locate (playhead_cursor->current_frame + distance);
        }
 }
 
@@ -400,7 +389,7 @@ Editor::nudge_backward (bool next, bool force_playhead)
 
        get_regions_for_action (rs);
 
-       if (!session) return;
+       if (!_session) return;
 
        if (!force_playhead && !rs.empty()) {
 
@@ -423,7 +412,7 @@ Editor::nudge_backward (bool next, bool force_playhead)
                                r->set_position (0, this);
                        }
                         XMLNode &after = r->playlist()->get_state();
-                       session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
+                       _session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
                }
 
                commit_reversible_command ();
@@ -467,7 +456,7 @@ Editor::nudge_backward (bool next, bool force_playhead)
                                }
 
                                XMLNode& after (loc->get_state());
-                               session->add_command (new MementoCommand<Location>(*loc, &before, &after));
+                               _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
                        }
                }
 
@@ -478,9 +467,9 @@ Editor::nudge_backward (bool next, bool force_playhead)
                distance = get_nudge_distance (playhead_cursor->current_frame, next_distance);
 
                if (playhead_cursor->current_frame > distance) {
-                       session->request_locate (playhead_cursor->current_frame - distance);
+                       _session->request_locate (playhead_cursor->current_frame - distance);
                } else {
-                       session->goto_start();
+                       _session->goto_start();
                }
        }
 }
@@ -493,13 +482,13 @@ Editor::nudge_forward_capture_offset ()
 
        get_regions_for_action (rs);
 
-       if (!session) return;
+       if (!_session) return;
 
        if (!rs.empty()) {
 
                begin_reversible_command (_("nudge forward"));
 
-               distance = session->worst_output_latency();
+               distance = _session->worst_output_latency();
 
                for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                        boost::shared_ptr<Region> r ((*i)->region());
@@ -507,7 +496,7 @@ Editor::nudge_forward_capture_offset ()
                        XMLNode &before = r->playlist()->get_state();
                        r->set_position (r->position() + distance, this);
                        XMLNode &after = r->playlist()->get_state();
-                       session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
+                       _session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
                }
 
                commit_reversible_command ();
@@ -523,13 +512,13 @@ Editor::nudge_backward_capture_offset ()
 
        get_regions_for_action (rs);
 
-       if (!session) return;
+       if (!_session) return;
 
        if (!rs.empty()) {
 
                begin_reversible_command (_("nudge forward"));
 
-               distance = session->worst_output_latency();
+               distance = _session->worst_output_latency();
 
                for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                        boost::shared_ptr<Region> r ((*i)->region());
@@ -542,7 +531,7 @@ Editor::nudge_backward_capture_offset ()
                                r->set_position (0, this);
                        }
                         XMLNode &after = r->playlist()->get_state();
-                       session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
+                       _session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
                }
 
                commit_reversible_command ();
@@ -554,14 +543,14 @@ Editor::nudge_backward_capture_offset ()
 void
 Editor::move_to_start ()
 {
-       session->goto_start ();
+       _session->goto_start ();
 }
 
 void
 Editor::move_to_end ()
 {
 
-       session->request_locate (session->current_end_frame());
+       _session->request_locate (_session->current_end_frame());
 }
 
 void
@@ -575,7 +564,7 @@ Editor::build_region_boundary_cache ()
 
        region_boundary_cache.clear ();
 
-       if (session == 0) {
+       if (_session == 0) {
                return;
        }
 
@@ -608,7 +597,7 @@ Editor::build_region_boundary_cache ()
                tlist = track_views;
        }
 
-       while (pos < session->current_end_frame() && !at_end) {
+       while (pos < _session->current_end_frame() && !at_end) {
 
                nframes64_t rpos;
                nframes64_t lpos = max_frames;
@@ -725,7 +714,7 @@ Editor::find_next_region (nframes64_t frame, RegionPoint point, int32_t dir, Tra
                        break;
                }
 
-               // rpos is a "track frame", converting it to "session frame"
+               // rpos is a "track frame", converting it to "_session frame"
                rpos = track_frame_to_session_frame(rpos, track_speed);
 
                if (rpos > frame) {
@@ -818,7 +807,7 @@ Editor::cursor_to_region_boundary (bool with_selection, int32_t dir)
        nframes64_t pos = playhead_cursor->current_frame;
        nframes64_t target;
 
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -831,8 +820,7 @@ Editor::cursor_to_region_boundary (bool with_selection, int32_t dir)
                return;
        }
 
-
-       session->request_locate (target);
+       _session->request_locate (target);
 }
 
 void
@@ -853,7 +841,7 @@ Editor::cursor_to_region_point (EditorCursor* cursor, RegionPoint point, int32_t
        boost::shared_ptr<Region> r;
        nframes64_t pos = cursor->current_frame;
 
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -910,7 +898,7 @@ Editor::cursor_to_region_point (EditorCursor* cursor, RegionPoint point, int32_t
        pos = track_frame_to_session_frame(pos, speed);
 
        if (cursor == playhead_cursor) {
-               session->request_locate (pos);
+               _session->request_locate (pos);
        } else {
                cursor->set_position (pos);
        }
@@ -954,7 +942,7 @@ Editor::cursor_to_selection_start (EditorCursor *cursor)
        }
 
        if (cursor == playhead_cursor) {
-               session->request_locate (pos);
+               _session->request_locate (pos);
        } else {
                cursor->set_position (pos);
        }
@@ -986,7 +974,7 @@ Editor::cursor_to_selection_end (EditorCursor *cursor)
        }
 
        if (cursor == playhead_cursor) {
-               session->request_locate (pos);
+               _session->request_locate (pos);
        } else {
                cursor->set_position (pos);
        }
@@ -999,7 +987,7 @@ Editor::selected_marker_to_region_boundary (bool with_selection, int32_t dir)
        Location* loc;
        bool ignored;
 
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -1052,7 +1040,7 @@ Editor::selected_marker_to_region_point (RegionPoint point, int32_t dir)
        Location* loc;
        bool ignored;
 
-       if (!session || selection->markers.empty()) {
+       if (!_session || selection->markers.empty()) {
                return;
        }
 
@@ -1128,7 +1116,7 @@ Editor::selected_marker_to_selection_start ()
        Location* loc;
        bool ignored;
 
-       if (!session || selection->markers.empty()) {
+       if (!_session || selection->markers.empty()) {
                return;
        }
 
@@ -1167,7 +1155,7 @@ Editor::selected_marker_to_selection_end ()
        Location* loc;
        bool ignored;
 
-       if (!session || selection->markers.empty()) {
+       if (!_session || selection->markers.empty()) {
                return;
        }
 
@@ -1229,7 +1217,7 @@ Editor::scroll_playhead (bool forward)
                }
        }
 
-       session->request_locate (pos);
+       _session->request_locate (pos);
 }
 
 void
@@ -1244,7 +1232,7 @@ Editor::playhead_backward ()
                cnt = 1;
        } else {
                if (was_floating) {
-                       cnt = (nframes64_t) floor (prefix * session->frame_rate ());
+                       cnt = (nframes64_t) floor (prefix * _session->frame_rate ());
                } else {
                        cnt = (nframes64_t) prefix;
                }
@@ -1263,7 +1251,7 @@ Editor::playhead_backward ()
           reload, just to move 1 sample !!!
        */
 
-       session->request_locate (pos);
+       _session->request_locate (pos);
 }
 
 void
@@ -1278,7 +1266,7 @@ Editor::playhead_forward ()
                cnt = 1;
        } else {
                if (was_floating) {
-                       cnt = (nframes64_t) floor (prefix * session->frame_rate ());
+                       cnt = (nframes64_t) floor (prefix * _session->frame_rate ());
                } else {
                        cnt = (nframes64_t) floor (prefix);
                }
@@ -1291,13 +1279,13 @@ Editor::playhead_forward ()
           reload, just to move 1 sample !!!
        */
 
-       session->request_locate (pos+cnt);
+       _session->request_locate (pos+cnt);
 }
 
 void
 Editor::cursor_align (bool playhead_to_edit)
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -1307,7 +1295,7 @@ Editor::cursor_align (bool playhead_to_edit)
                        return;
                }
 
-               session->request_locate (selection->markers.front()->position(), session->transport_rolling());
+               _session->request_locate (selection->markers.front()->position(), _session->transport_rolling());
 
        } else {
                /* move selected markers to playhead */
@@ -1339,7 +1327,7 @@ Editor::edit_cursor_backward ()
                cnt = 1;
        } else {
                if (was_floating) {
-                       cnt = (nframes64_t) floor (prefix * session->frame_rate ());
+                       cnt = (nframes64_t) floor (prefix * _session->frame_rate ());
                } else {
                        cnt = (nframes64_t) prefix;
                }
@@ -1370,7 +1358,7 @@ Editor::edit_cursor_forward ()
                cnt = 1;
        } else {
                if (was_floating) {
-                       cnt = (nframes64_t) floor (prefix * session->frame_rate ());
+                       cnt = (nframes64_t) floor (prefix * _session->frame_rate ());
                } else {
                        cnt = (nframes64_t) floor (prefix);
                }
@@ -1392,12 +1380,12 @@ Editor::goto_frame ()
        }
 
        if (was_floating) {
-               frame = (nframes64_t) floor (prefix * session->frame_rate());
+               frame = (nframes64_t) floor (prefix * _session->frame_rate());
        } else {
                frame = (nframes64_t) floor (prefix);
        }
 
-       session->request_locate (frame);
+       _session->request_locate (frame);
 }
 
 void
@@ -1413,7 +1401,7 @@ Editor::scroll_backward (float pages)
                cnt = (nframes64_t) floor (pages * one_page);
        } else {
                if (was_floating) {
-                       cnt = (nframes64_t) floor (prefix * session->frame_rate());
+                       cnt = (nframes64_t) floor (prefix * _session->frame_rate());
                } else {
                        cnt = (nframes64_t) floor (prefix * one_page);
                }
@@ -1441,7 +1429,7 @@ Editor::scroll_forward (float pages)
                cnt = (nframes64_t) floor (pages * one_page);
        } else {
                if (was_floating) {
-                       cnt = (nframes64_t) floor (prefix * session->frame_rate());
+                       cnt = (nframes64_t) floor (prefix * _session->frame_rate());
                } else {
                        cnt = (nframes64_t) floor (prefix * one_page);
                }
@@ -1496,21 +1484,19 @@ Editor::scroll_tracks_up ()
 void
 Editor::scroll_tracks_down_line ()
 {
+       double vert_value = vertical_adjustment.get_value() + 60;
 
-        Gtk::Adjustment* adj = edit_vscrollbar.get_adjustment();
-       double vert_value = adj->get_value() + 60;
-
-       if (vert_value>adj->get_upper() - _canvas_height) {
-               vert_value = adj->get_upper() - _canvas_height;
+       if (vert_value > vertical_adjustment.get_upper() - _canvas_height) {
+               vert_value = vertical_adjustment.get_upper() - _canvas_height;
        }
-       adj->set_value (vert_value);
+       
+       vertical_adjustment.set_value (vert_value);
 }
 
 void
 Editor::scroll_tracks_up_line ()
 {
-        Gtk::Adjustment* adj = edit_vscrollbar.get_adjustment();
-       adj->set_value (adj->get_value() - 60);
+       reset_y_origin (vertical_adjustment.get_value() - 60);
 }
 
 /* ZOOM */
@@ -1518,7 +1504,7 @@ Editor::scroll_tracks_up_line ()
 void
 Editor::tav_zoom_step (bool coarser)
 {
-       ENSURE_GUI_THREAD (bind (mem_fun (*this, &Editor::temporal_zoom_step), coarser));
+       ENSURE_GUI_THREAD (*this, &Editor::temporal_zoom_step, coarser)
 
        _routes->suspend_redisplay ();
 
@@ -1533,7 +1519,7 @@ Editor::tav_zoom_step (bool coarser)
 void
 Editor::temporal_zoom_step (bool coarser)
 {
-       ENSURE_GUI_THREAD (bind (mem_fun (*this, &Editor::temporal_zoom_step), coarser));
+       ENSURE_GUI_THREAD (*this, &Editor::temporal_zoom_step, coarser)
 
        double nfpu;
 
@@ -1551,7 +1537,7 @@ Editor::temporal_zoom_step (bool coarser)
 void
 Editor::temporal_zoom (gdouble fpu)
 {
-       if (!session) return;
+       if (!_session) return;
 
        nframes64_t current_page = current_page_frames();
        nframes64_t current_leftmost = leftmost_frame;
@@ -1600,11 +1586,8 @@ Editor::temporal_zoom (gdouble fpu)
                break;
 
        case ZoomFocusPlayhead:
-               /* try to keep the playhead in the same place */
-
-               where = playhead_cursor->current_frame;
-
-               l = - ((new_page_size * ((where - current_leftmost)/(double)current_page)) - where);
+               /* centre playhead */
+               l = playhead_cursor->current_frame - (new_page_size * 0.5);
 
                if (l < 0) {
                        leftmost_after_zoom = 0;
@@ -1667,7 +1650,7 @@ Editor::temporal_zoom (gdouble fpu)
 
        }
 
-       // leftmost_after_zoom = min (leftmost_after_zoom, session->current_end_frame());
+       // leftmost_after_zoom = min (leftmost_after_zoom, _session->current_end_frame());
 
        reposition_and_zoom (leftmost_after_zoom, nfpu);
 }
@@ -1793,17 +1776,17 @@ Editor::temporal_zoom_selection ()
 void
 Editor::temporal_zoom_session ()
 {
-       ENSURE_GUI_THREAD (mem_fun (*this, &Editor::temporal_zoom_session));
+       ENSURE_GUI_THREAD (*this, &Editor::temporal_zoom_session)
 
-       if (session) {
-               temporal_zoom_by_frame (session->current_start_frame(), session->current_end_frame(), "zoom to session");
+       if (_session) {
+               temporal_zoom_by_frame (_session->current_start_frame(), _session->current_end_frame(), "zoom to _session");
        }
 }
 
 void
 Editor::temporal_zoom_by_frame (nframes64_t start, nframes64_t end, const string & /*op*/)
 {
-       if (!session) return;
+       if (!_session) return;
 
        if ((start == 0 && end == 0) || end < start) {
                return;
@@ -1827,7 +1810,7 @@ Editor::temporal_zoom_by_frame (nframes64_t start, nframes64_t end, const string
 void
 Editor::temporal_zoom_to_frame (bool coarser, nframes64_t frame)
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
        double range_before = frame - leftmost_frame;
@@ -1853,8 +1836,8 @@ Editor::temporal_zoom_to_frame (bool coarser, nframes64_t frame)
                new_leftmost = 0;
        }
 //     begin_reversible_command (_("zoom to frame"));
-//     session->add_undo (bind (mem_fun(*this, &Editor::reposition_and_zoom), leftmost_frame, frames_per_unit));
-//     session->add_redo (bind (mem_fun(*this, &Editor::reposition_and_zoom), new_leftmost, new_fpu));
+//     _session->add_undo (sigc::bind (sigc::mem_fun(*this, &Editor::reposition_and_zoom), leftmost_frame, frames_per_unit));
+//     _session->add_redo (sigc::bind (sigc::mem_fun(*this, &Editor::reposition_and_zoom), new_leftmost, new_fpu));
 //     commit_reversible_command ();
 
        reposition_and_zoom (new_leftmost, new_fpu);
@@ -1906,22 +1889,22 @@ Editor::add_location_from_selection ()
                return;
        }
 
-       if (session == 0 || clicked_axisview == 0) {
+       if (_session == 0 || clicked_axisview == 0) {
                return;
        }
 
        nframes64_t start = selection->time[clicked_selection].start;
        nframes64_t end = selection->time[clicked_selection].end;
 
-       session->locations()->next_available_name(rangename,"selection");
+       _session->locations()->next_available_name(rangename,"selection");
        Location *location = new Location (start, end, rangename, Location::IsRangeMarker);
 
-       session->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 ();
+       _session->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 ();
 }
 
 void
@@ -1931,23 +1914,23 @@ Editor::add_location_mark (nframes64_t where)
 
        select_new_marker = true;
 
-       session->locations()->next_available_name(markername,"mark");
+       _session->locations()->next_available_name(markername,"mark");
        if (!choose_new_marker_name(markername)) {
                return;
        }
        Location *location = new Location (where, where, markername, Location::IsMark);
-       session->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 ();
+       _session->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 ();
 }
 
 void
 Editor::add_location_from_playhead_cursor ()
 {
-       add_location_mark (session->audible_frame());
+       add_location_mark (_session->audible_frame());
 }
 
 void
@@ -1961,8 +1944,8 @@ Editor::add_locations_from_audio_region ()
                return;
        }
 
-       session->begin_reversible_command (rs.size () > 1 ? _("add markers") : _("add marker"));
-       XMLNode &before = session->locations()->get_state();
+       _session->begin_reversible_command (rs.size () > 1 ? _("add markers") : _("add marker"));
+       XMLNode &before = _session->locations()->get_state();
 
        cerr << "Add locations\n";
 
@@ -1972,12 +1955,12 @@ Editor::add_locations_from_audio_region ()
 
                Location *location = new Location (region->position(), region->last_frame(), region->name(), Location::IsRangeMarker);
 
-               session->locations()->add (location, true);
+               _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 ();
+       XMLNode &after = _session->locations()->get_state();
+       _session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
+       _session->commit_reversible_command ();
 }
 
 void
@@ -1991,13 +1974,13 @@ Editor::add_location_from_audio_region ()
                return;
        }
 
-       session->begin_reversible_command (_("add marker"));
-       XMLNode &before = session->locations()->get_state();
+       _session->begin_reversible_command (_("add marker"));
+       XMLNode &before = _session->locations()->get_state();
 
        string markername;
 
        if (rs.size() > 1) {            // more than one region selected
-               session->locations()->next_available_name(markername, "regions");
+               _session->locations()->next_available_name(markername, "regions");
        } else {
                RegionView* rv = *(rs.begin());
                boost::shared_ptr<Region> region = rv->region();
@@ -2012,11 +1995,11 @@ Editor::add_location_from_audio_region ()
 
        // single range spanning all selected
        Location *location = new Location (rs.start(), rs.end_frame(), markername, Location::IsRangeMarker);
-       session->locations()->add (location, true);
+       _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 ();
+       XMLNode &after = _session->locations()->get_state();
+       _session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
+       _session->commit_reversible_command ();
 }
 
 void
@@ -2077,32 +2060,32 @@ Editor::search_forwards ()
 void
 Editor::jump_forward_to_mark ()
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
-       Location *location = session->locations()->first_location_after (playhead_cursor->current_frame);
+       Location *location = _session->locations()->first_location_after (playhead_cursor->current_frame);
 
        if (location) {
-               session->request_locate (location->start(), session->transport_rolling());
+               _session->request_locate (location->start(), _session->transport_rolling());
        } else {
-               session->request_locate (session->current_end_frame());
+               _session->request_locate (_session->current_end_frame());
        }
 }
 
 void
 Editor::jump_backward_to_mark ()
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
-       Location *location = session->locations()->first_location_before (playhead_cursor->current_frame);
+       Location *location = _session->locations()->first_location_before (playhead_cursor->current_frame);
 
        if (location) {
-               session->request_locate (location->start(), session->transport_rolling());
+               _session->request_locate (location->start(), _session->transport_rolling());
        } else {
-               session->goto_start ();
+               _session->goto_start ();
        }
 }
 
@@ -2115,66 +2098,66 @@ Editor::set_mark ()
        string markername;
 
        if (get_prefix (prefix, was_floating)) {
-               pos = session->audible_frame ();
+               pos = _session->audible_frame ();
        } else {
                if (was_floating) {
-                       pos = (nframes64_t) floor (prefix * session->frame_rate ());
+                       pos = (nframes64_t) floor (prefix * _session->frame_rate ());
                } else {
                        pos = (nframes64_t) floor (prefix);
                }
        }
 
-       session->locations()->next_available_name(markername,"mark");
+       _session->locations()->next_available_name(markername,"mark");
        if (!choose_new_marker_name(markername)) {
                return;
        }
-       session->locations()->add (new Location (pos, 0, markername, Location::IsMark), true);
+       _session->locations()->add (new Location (pos, 0, markername, Location::IsMark), true);
 }
 
 void
 Editor::clear_markers ()
 {
-       if (session) {
-               session->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 ();
+       if (_session) {
+               _session->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 ();
        }
 }
 
 void
 Editor::clear_ranges ()
 {
-       if (session) {
-               session->begin_reversible_command (_("clear ranges"));
-                XMLNode &before = session->locations()->get_state();
+       if (_session) {
+               _session->begin_reversible_command (_("clear ranges"));
+                XMLNode &before = _session->locations()->get_state();
 
-               Location * looploc = session->locations()->auto_loop_location();
-               Location * punchloc = session->locations()->auto_punch_location();
+               Location * looploc = _session->locations()->auto_loop_location();
+               Location * punchloc = _session->locations()->auto_punch_location();
 
-               session->locations()->clear_ranges ();
+               _session->locations()->clear_ranges ();
                // re-add these
-               if (looploc) session->locations()->add (looploc);
-               if (punchloc) session->locations()->add (punchloc);
+               if (looploc) _session->locations()->add (looploc);
+               if (punchloc) _session->locations()->add (punchloc);
 
-                XMLNode &after = session->locations()->get_state();
-               session->add_command(new MementoCommand<Locations>(*(session->locations()), &before, &after));
-               session->commit_reversible_command ();
+                XMLNode &after = _session->locations()->get_state();
+               _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
+               _session->commit_reversible_command ();
        }
 }
 
 void
 Editor::clear_locations ()
 {
-       session->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 ();
+       _session->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 ();
 }
 
 void
@@ -2244,7 +2227,7 @@ Editor::insert_region_list_drag (boost::shared_ptr<Region> region, int x, int y)
        begin_reversible_command (_("insert dragged region"));
         XMLNode &before = playlist->get_state();
        playlist->add_region (RegionFactory::create (region), where, 1.0);
-       session->add_command(new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
+       _session->add_command(new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
        commit_reversible_command ();
 }
 
@@ -2322,7 +2305,7 @@ Editor::insert_region_list_selection (float times)
        begin_reversible_command (_("insert region"));
        XMLNode &before = playlist->get_state();
        playlist->add_region ((RegionFactory::create (region)), get_preferred_edit_position(), times);
-       session->add_command(new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
+       _session->add_command(new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
        commit_reversible_command ();
 }
 
@@ -2346,37 +2329,38 @@ Editor::edit_envelope ()
 void
 Editor::transition_to_rolling (bool fwd)
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
-       switch (Config->get_slave_source()) {
-       case None:
-       case JACK:
-               break;
-       default:
-               /* transport controlled by the master */
-               return;
+       if (_session->config.get_external_sync()) {
+               switch (_session->config.get_sync_source()) {
+               case JACK:
+                       break;
+               default:
+                       /* transport controlled by the master */
+                       return;
+               }
        }
 
-       if (session->is_auditioning()) {
-               session->cancel_audition ();
+       if (_session->is_auditioning()) {
+               _session->cancel_audition ();
                return;
        }
 
-       session->request_transport_speed (fwd ? 1.0f : -1.0f);
+       _session->request_transport_speed (fwd ? 1.0f : -1.0f);
 }
 
 void
 Editor::play_from_start ()
 {
-       session->request_locate (session->current_start_frame(), true);
+       _session->request_locate (_session->current_start_frame(), true);
 }
 
 void
 Editor::play_from_edit_point ()
 {
-       session->request_locate (get_preferred_edit_position(), true);
+       _session->request_locate (get_preferred_edit_position(), true);
 }
 
 void
@@ -2387,19 +2371,19 @@ Editor::play_from_edit_point_and_return ()
 
        start_frame = get_preferred_edit_position (true);
 
-       if (session->transport_rolling()) {
-               session->request_locate (start_frame, false);
+       if (_session->transport_rolling()) {
+               _session->request_locate (start_frame, false);
                return;
        }
 
        /* don't reset the return frame if its already set */
 
-       if ((return_frame = session->requested_return_frame()) < 0) {
-               return_frame = session->audible_frame();
+       if ((return_frame = _session->requested_return_frame()) < 0) {
+               return_frame = _session->audible_frame();
        }
 
        if (start_frame >= 0) {
-               session->request_roll_at_and_return (start_frame, return_frame);
+               _session->request_roll_at_and_return (start_frame, return_frame);
        }
 }
 
@@ -2410,7 +2394,7 @@ Editor::play_selection ()
                return;
        }
 
-       session->request_play_range (&selection->time, true);
+       _session->request_play_range (&selection->time, true);
 }
 
 void
@@ -2430,9 +2414,9 @@ Editor::loop_selected_region ()
 
                        // enable looping, reposition and start rolling
 
-                       session->request_play_loop (true);
-                       session->request_locate (tll->start(), false);
-                       session->request_transport_speed (1.0f);
+                       _session->request_play_loop (true);
+                       _session->request_locate (tll->start(), false);
+                       _session->request_transport_speed (1.0f);
                }
        }
 }
@@ -2444,7 +2428,7 @@ Editor::play_location (Location& location)
                return;
        }
 
-       session->request_bounded_roll (location.start(), location.end());
+       _session->request_bounded_roll (location.start(), location.end());
 }
 
 void
@@ -2460,8 +2444,8 @@ Editor::loop_location (Location& location)
                tll->set (location.start(), location.end());
 
                // enable looping, reposition and start rolling
-               session->request_play_loop (true);
-               session->request_locate (tll->start(), true);
+               _session->request_play_loop (true);
+               _session->request_locate (tll->start(), true);
        }
 }
 
@@ -2535,7 +2519,7 @@ Editor::rename_region()
        entry.set_text (rs.front()->region()->name());
        entry.select_region (0, -1);
 
-       entry.signal_activate().connect (bind (mem_fun (d, &Dialog::response), RESPONSE_OK));
+       entry.signal_activate().connect (sigc::bind (sigc::mem_fun (d, &Dialog::response), RESPONSE_OK));
 
        d.show_all ();
 
@@ -2558,8 +2542,8 @@ Editor::rename_region()
 void
 Editor::audition_playlist_region_via_route (boost::shared_ptr<Region> region, Route& route)
 {
-       if (session->is_auditioning()) {
-               session->cancel_audition ();
+       if (_session->is_auditioning()) {
+               _session->cancel_audition ();
        }
 
        // note: some potential for creativity here, because region doesn't
@@ -2569,7 +2553,7 @@ Editor::audition_playlist_region_via_route (boost::shared_ptr<Region> region, Ro
 
        route.set_solo (true, this);
 
-       session->request_bounded_roll (region->position(), region->position() + region->length());
+       _session->request_bounded_roll (region->position(), region->position() + region->length());
 
        /* XXX how to unset the solo state ? */
 }
@@ -2581,7 +2565,7 @@ Editor::play_edit_range ()
        nframes64_t start, end;
 
        if (get_edit_op_range (start, end)) {
-               session->request_bounded_roll (start, end);
+               _session->request_bounded_roll (start, end);
        }
 }
 
@@ -2607,13 +2591,13 @@ Editor::play_selected_region ()
                }
        }
 
-       session->request_bounded_roll (start, end);
+       _session->request_bounded_roll (start, end);
 }
 
 void
 Editor::audition_playlist_region_standalone (boost::shared_ptr<Region> region)
 {
-       session->audition_region (region);
+       _session->audition_region (region);
 }
 
 void
@@ -2634,7 +2618,7 @@ Editor::build_interthread_progress_window ()
        // GTK2FIX: this button needs a modifiable label
 
        Button* b = interthread_progress_window->add_button (Stock::CANCEL, RESPONSE_CANCEL);
-       b->signal_clicked().connect (mem_fun(*this, &Editor::interthread_cancel_clicked));
+       b->signal_clicked().connect (sigc::mem_fun(*this, &Editor::interthread_cancel_clicked));
 
        interthread_cancel_button.add (interthread_cancel_label);
 
@@ -2663,7 +2647,7 @@ Editor::region_from_selection ()
        nframes64_t start = selection->time[clicked_selection].start;
        nframes64_t end = selection->time[clicked_selection].end;
 
-       TrackSelection tracks = get_tracks_for_range_action ();
+       TrackViewList tracks = get_tracks_for_range_action ();
 
        nframes64_t selection_cnt = end - start + 1;
 
@@ -2682,7 +2666,7 @@ Editor::region_from_selection ()
                }
 
                internal_start = start - current->position();
-               session->region_name (new_name, current->name(), true);
+               _session->region_name (new_name, current->name(), true);
                boost::shared_ptr<Region> region (RegionFactory::create (current,
                                internal_start, selection_cnt, new_name));
        }
@@ -2715,7 +2699,7 @@ Editor::create_region_from_selection (vector<boost::shared_ptr<Region> >& new_re
                }
 
                internal_start = start - current->position();
-               session->region_name (new_name, current->name(), true);
+               _session->region_name (new_name, current->name(), true);
 
                new_regions.push_back (RegionFactory::create (current,
                                        internal_start, end - start + 1, new_name));
@@ -2736,7 +2720,7 @@ Editor::split_multichannel_region ()
        vector< boost::shared_ptr<Region> > v;
 
        for (list<RegionView*>::iterator x = rs.begin(); x != rs.end(); ++x) {
-               (*x)->region()->separate_by_channel (*session, v);
+               (*x)->region()->separate_by_channel (*_session, v);
        }
 }
 
@@ -2764,10 +2748,10 @@ add_if_covered (RegionView* rv, const AudioRange* ar, RegionSelection* rs)
  *    - all tracks
  * @return tracks.
  */
-TrackSelection
+TrackViewList
 Editor::get_tracks_for_range_action () const
 {
-       TrackSelection t;
+       TrackViewList t;
 
        if (selection->tracks.empty()) {
 
@@ -2803,7 +2787,7 @@ Editor::separate_regions_between (const TimeSelection& ts)
        boost::shared_ptr<Playlist> playlist;
        RegionSelection new_selection;
 
-       TrackSelection tmptracks = get_tracks_for_range_action ();
+       TrackViewList tmptracks = get_tracks_for_range_action ();
        sort_track_selection (&tmptracks);
 
        for (TrackSelection::iterator i = tmptracks.begin(); i != tmptracks.end(); ++i) {
@@ -2836,7 +2820,7 @@ Editor::separate_regions_between (const TimeSelection& ts)
                                        for (list<AudioRange>::const_iterator t = ts.begin(); t != ts.end(); ++t) {
 
                                                sigc::connection c = rtv->view()->RegionViewAdded.connect (
-                                                               mem_fun(*this, &Editor::collect_new_region_view));
+                                                               sigc::mem_fun(*this, &Editor::collect_new_region_view));
                                                latest_regionviews.clear ();
 
                                                playlist->partition ((nframes64_t)((*t).start * speed),
@@ -2848,7 +2832,7 @@ Editor::separate_regions_between (const TimeSelection& ts)
 
                                                        got_some = true;
 
-                                                       rtv->view()->foreach_regionview (bind (
+                                                       rtv->view()->foreach_regionview (sigc::bind (
                                                                                sigc::ptr_fun (add_if_covered),
                                                                                &(*t), &new_selection));
 
@@ -2857,7 +2841,7 @@ Editor::separate_regions_between (const TimeSelection& ts)
                                                                in_command = true;
                                                        }
 
-                                                       session->add_command(new MementoCommand<Playlist>(
+                                                       _session->add_command(new MementoCommand<Playlist>(
                                                                        *playlist, before, &playlist->get_state()));
                                                }
                                        }
@@ -2913,7 +2897,7 @@ Editor::separate_region_from_selection ()
 void
 Editor::separate_region_from_punch ()
 {
-       Location* loc  = session->locations()->auto_punch_location();
+       Location* loc  = _session->locations()->auto_punch_location();
        if (loc) {
                separate_regions_using_location (*loc);
        }
@@ -2922,7 +2906,7 @@ Editor::separate_region_from_punch ()
 void
 Editor::separate_region_from_loop ()
 {
-       Location* loc  = session->locations()->auto_loop_location();
+       Location* loc  = _session->locations()->auto_loop_location();
        if (loc) {
                separate_regions_using_location (*loc);
        }
@@ -2967,7 +2951,7 @@ Editor::crop_region_to (nframes64_t start, nframes64_t end)
 {
        vector<boost::shared_ptr<Playlist> > playlists;
        boost::shared_ptr<Playlist> playlist;
-       TrackSelection* ts;
+       TrackViewList* ts;
 
        if (selection->tracks.empty()) {
                ts = &track_views;
@@ -3029,7 +3013,7 @@ Editor::crop_region_to (nframes64_t start, nframes64_t end)
                XMLNode &before = (*i)->get_state();
                region->trim_to (the_start, cnt, this);
                XMLNode &after = (*i)->get_state();
-               session->add_command (new MementoCommand<Playlist>(*(*i), &before, &after));
+               _session->add_command (new MementoCommand<Playlist>(*(*i), &before, &after));
        }
 
        commit_reversible_command ();
@@ -3043,11 +3027,11 @@ Editor::region_fill_track ()
 
        get_regions_for_action (rs);
 
-       if (!session || rs.empty()) {
+       if (!_session || rs.empty()) {
                return;
        }
 
-       end = session->current_end_frame ();
+       end = _session->current_end_frame ();
 
        begin_reversible_command (_("region fill"));
 
@@ -3069,7 +3053,7 @@ Editor::region_fill_track ()
 
                XMLNode &before = pl->get_state();
                pl->add_region (RegionFactory::create (region), region->last_frame(), times);
-               session->add_command (new MementoCommand<Playlist>(*pl, &before, &pl->get_state()));
+               _session->add_command (new MementoCommand<Playlist>(*pl, &before, &pl->get_state()));
        }
 
        commit_reversible_command ();
@@ -3113,7 +3097,7 @@ Editor::region_fill_selection ()
 
                 XMLNode &before = playlist->get_state();
                playlist->add_region (RegionFactory::create (region), start, times);
-               session->add_command (new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
+               _session->add_command (new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
        }
 
        commit_reversible_command ();
@@ -3149,7 +3133,7 @@ Editor::set_sync_point (nframes64_t where, const RegionSelection& rs)
                XMLNode &before = region->playlist()->get_state();
                region->set_sync_position (where);
                XMLNode &after = region->playlist()->get_state();
-               session->add_command(new MementoCommand<Playlist>(*(region->playlist()), &before, &after));
+               _session->add_command(new MementoCommand<Playlist>(*(region->playlist()), &before, &after));
        }
 
        if (in_command) {
@@ -3175,7 +3159,7 @@ Editor::remove_region_sync ()
                 XMLNode &before = (*i)->region()->playlist()->get_state();
                (*i)->region()->clear_sync_position ();
                 XMLNode &after = (*i)->region()->playlist()->get_state();
-               session->add_command(new MementoCommand<Playlist>(*((*i)->region()->playlist()), &before, &after));
+               _session->add_command(new MementoCommand<Playlist>(*((*i)->region()->playlist()), &before, &after));
        }
        commit_reversible_command ();
 }
@@ -3196,7 +3180,7 @@ Editor::naturalize ()
                 XMLNode &before = (*i)->region()->get_state();
                (*i)->region()->move_to_natural_position (this);
                 XMLNode &after = (*i)->region()->get_state();
-               session->add_command (new MementoCommand<Region>(*((*i)->region().get()), &before, &after));
+               _session->add_command (new MementoCommand<Region>(*((*i)->region().get()), &before, &after));
        }
        commit_reversible_command ();
 }
@@ -3298,7 +3282,7 @@ Editor::align_selection_relative (RegionPoint point, nframes64_t position, const
        XMLNode &before = r->playlist()->get_state();
        r->set_position (pos, this);
        XMLNode &after = r->playlist()->get_state();
-       session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
+       _session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
 
        /* move rest by the same amount */
 
@@ -3317,7 +3301,7 @@ Editor::align_selection_relative (RegionPoint point, nframes64_t position, const
                }
 
                 XMLNode &after = region->playlist()->get_state();
-               session->add_command(new MementoCommand<Playlist>(*(region->playlist()), &before, &after));
+               _session->add_command(new MementoCommand<Playlist>(*(region->playlist()), &before, &after));
 
        }
 
@@ -3370,7 +3354,7 @@ Editor::align_region_internal (boost::shared_ptr<Region> region, RegionPoint poi
        }
 
        XMLNode &after = region->playlist()->get_state();
-       session->add_command(new MementoCommand<Playlist>(*(region->playlist()), &before, &after));
+       _session->add_command(new MementoCommand<Playlist>(*(region->playlist()), &before, &after));
 }
 
 void
@@ -3409,7 +3393,7 @@ Editor::trim_region (bool front)
                                (*i)->region()->trim_end (where, this);
                        }
                        XMLNode &after = pl->get_state();
-                       session->add_command(new MementoCommand<Playlist>(*pl.get(), &before, &after));
+                       _session->add_command(new MementoCommand<Playlist>(*pl.get(), &before, &after));
                }
        }
 
@@ -3420,7 +3404,7 @@ Editor::trim_region (bool front)
 void
 Editor::trim_region_to_loop ()
 {
-       Location* loc = session->locations()->auto_loop_location();
+       Location* loc = _session->locations()->auto_loop_location();
        if (!loc) {
                return;
        }
@@ -3430,7 +3414,7 @@ Editor::trim_region_to_loop ()
 void
 Editor::trim_region_to_punch ()
 {
-       Location* loc = session->locations()->auto_punch_location();
+       Location* loc = _session->locations()->auto_punch_location();
        if (!loc) {
                return;
        }
@@ -3475,7 +3459,7 @@ Editor::trim_region_to_location (const Location& loc, const char* str)
                XMLNode &before = rv->region()->playlist()->get_state();
                rv->region()->trim_to (start, (end - start), this);
                XMLNode &after = rv->region()->playlist()->get_state();
-               session->add_command(new MementoCommand<Playlist>(
+               _session->add_command(new MementoCommand<Playlist>(
                                *(rv->region()->playlist()), &before, &after));
        }
 
@@ -3513,9 +3497,9 @@ Editor::trim_region_to_edit_point ()
                }
 
                XMLNode &before = rv->region()->playlist()->get_state();
-               rv->region()->trim_endsession_frame_to_track_frame(where, speed), this);
+               rv->region()->trim_end (session_frame_to_track_frame(where, speed), this);
                XMLNode &after = rv->region()->playlist()->get_state();
-               session->add_command(new MementoCommand<Playlist>(
+               _session->add_command(new MementoCommand<Playlist>(
                                *(rv->region()->playlist()), &before, &after));
        }
 
@@ -3553,9 +3537,9 @@ Editor::trim_region_from_edit_point ()
                }
 
                XMLNode &before = rv->region()->playlist()->get_state();
-               rv->region()->trim_front ( session_frame_to_track_frame(where, speed), this);
+               rv->region()->trim_front (session_frame_to_track_frame(where, speed), this);
                XMLNode &after = rv->region()->playlist()->get_state();
-               session->add_command(new MementoCommand<Playlist>(
+               _session->add_command(new MementoCommand<Playlist>(
                                *(rv->region()->playlist()), &before, &after));
        }
 
@@ -3635,7 +3619,7 @@ Editor::trim_to_region(bool forward)
                }
 
                XMLNode &after = playlist->get_state();
-               session->add_command(new MementoCommand<Playlist>(*playlist, &before, &after));
+               _session->add_command(new MementoCommand<Playlist>(*playlist, &before, &after));
        }
 
        commit_reversible_command ();
@@ -3654,7 +3638,8 @@ Editor::unfreeze_route ()
 void*
 Editor::_freeze_thread (void* arg)
 {
-       PBD::notify_gui_about_thread_creation (pthread_self(), X_("Freeze"));
+       SessionEvent::create_per_thread_pool ("freeze events", 64);
+
        return static_cast<Editor*>(arg)->freeze_thread ();
 }
 
@@ -3695,19 +3680,13 @@ Editor::freeze_route ()
        current_interthread_info = &itt;
 
        interthread_progress_connection =
-         Glib::signal_timeout().connect (bind (mem_fun(*this, &Editor::freeze_progress_timeout), (gpointer) 0), 100);
+         Glib::signal_timeout().connect (sigc::bind (sigc::mem_fun(*this, &Editor::freeze_progress_timeout), (gpointer) 0), 100);
 
        itt.done = false;
        itt.cancel = false;
        itt.progress = 0.0f;
 
-       pthread_attr_t attr;
-       pthread_attr_init(&attr);
-       pthread_attr_setstacksize(&attr, 500000);
-
-       pthread_create_and_store (X_("freezer"), &itt.thread, &attr, _freeze_thread, this);
-
-       pthread_attr_destroy(&attr);
+       pthread_create_and_store (X_("freezer"), &itt.thread, _freeze_thread, this);
 
        track_canvas->get_window()->set_cursor (Gdk::Cursor (Gdk::WATCH));
 
@@ -3767,7 +3746,7 @@ Editor::bounce_range_selection (bool replace, bool enable_processing)
                }
 
                 XMLNode &after = playlist->get_state();
-               session->add_command (new MementoCommand<Playlist> (*playlist, &before, &after));
+               _session->add_command (new MementoCommand<Playlist> (*playlist, &before, &after));
        }
 
        commit_reversible_command ();
@@ -3843,10 +3822,8 @@ Editor::cut_copy (CutCopyOp op)
        */
 
        if (op == Cut || op == Clear) {
-               if (_drag) {
-                       _drag->item()->ungrab (0);
-                       delete _drag;
-                       _drag = 0;
+               if (_drags->active ()) {
+                       _drags->abort ();
                }
        }
 
@@ -3859,14 +3836,11 @@ Editor::cut_copy (CutCopyOp op)
                bool ignored;
                Location* loc = find_location_from_marker (entered_marker, ignored);
 
-               if (session && loc) {
-                       Glib::signal_idle().connect (bind (mem_fun(*this, &Editor::really_remove_marker), loc));
+               if (_session && loc) {
+                       Glib::signal_idle().connect (sigc::bind (sigc::mem_fun(*this, &Editor::really_remove_marker), loc));
                }
 
-               break_drag ();
-               delete _drag;
-               _drag = 0;
-
+               _drags->break_drag ();
                return;
        }
 
@@ -3928,7 +3902,7 @@ Editor::cut_copy (CutCopyOp op)
                                if (!get_edit_op_range (start, end)) {
                                        return;
                                }
-                               selection->set ((TimeAxisView*) 0, start, end);
+                               selection->set (start, end);
                        }
 
                        begin_reversible_command (opname + _(" range"));
@@ -3947,9 +3921,7 @@ Editor::cut_copy (CutCopyOp op)
        }
 
        if (op == Cut || op == Clear) {
-               break_drag ();
-               delete _drag;
-               _drag = 0;
+               _drags->break_drag ();
        }
 }
 
@@ -3961,7 +3933,7 @@ Editor::cut_copy_points (CutCopyOp op)
 {
        for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
 
-               AutomationTimeAxisView* atv = dynamic_cast<AutomationTimeAxisView*>(&(*i).track);
+               AutomationTimeAxisView* atv = dynamic_cast<AutomationTimeAxisView*>((*i).track);
 
                if (atv) {
                        atv->cut_copy_clear_objects (selection->points, op);
@@ -4013,7 +3985,7 @@ Editor::remove_clicked_region ()
         XMLNode &before = playlist->get_state();
        playlist->remove_region (clicked_regionview->region());
         XMLNode &after = playlist->get_state();
-       session->add_command(new MementoCommand<Playlist>(*playlist, &before, &after));
+       _session->add_command(new MementoCommand<Playlist>(*playlist, &before, &after));
        commit_reversible_command ();
 }
 
@@ -4025,7 +3997,7 @@ Editor::remove_selected_regions ()
        RegionSelection rs;
        get_regions_for_action (rs);
 
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -4087,7 +4059,7 @@ Editor::remove_selected_regions ()
 
        for (pl = playlists.begin(); pl != playlists.end(); ++pl) {
                (*pl).playlist->thaw ();
-               session->add_command(new MementoCommand<Playlist>(*(*pl).playlist, (*pl).before, &(*pl).playlist->get_state()));
+               _session->add_command(new MementoCommand<Playlist>(*(*pl).playlist, (*pl).before, &(*pl).playlist->get_state()));
        }
 
        commit_reversible_command ();
@@ -4182,7 +4154,7 @@ Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
                assert (z != pmap.end());
 
                if (!(*z).pl) {
-                       npl = PlaylistFactory::create (pl->data_type(), *session, "cutlist", true);
+                       npl = PlaylistFactory::create (pl->data_type(), *_session, "cutlist", true);
                        npl->freeze();
                        (*z).pl = npl;
                } else {
@@ -4230,15 +4202,15 @@ Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
 
        for (set<PlaylistState, lt_playlist>::iterator pl = freezelist.begin(); pl != freezelist.end(); ++pl) {
                (*pl).playlist->thaw ();
-               session->add_command (new MementoCommand<Playlist>(*(*pl).playlist, (*pl).before, &(*pl).playlist->get_state()));
+               _session->add_command (new MementoCommand<Playlist>(*(*pl).playlist, (*pl).before, &(*pl).playlist->get_state()));
        }
 }
 
 void
 Editor::cut_copy_ranges (CutCopyOp op)
 {
-       TrackSelection* ts;
-       TrackSelection entered;
+       TrackViewList* ts;
+       TrackViewList entered;
 
        if (selection->tracks.empty()) {
                if (!entered_track) {
@@ -4296,8 +4268,8 @@ Editor::paste_internal (nframes64_t position, float times)
 
        begin_reversible_command (_("paste"));
 
-       TrackSelection ts;
-       TrackSelection::iterator i;
+       TrackViewList ts;
+       TrackViewList::iterator i;
        size_t nth;
 
        /* get everything in the correct order */
@@ -4343,62 +4315,6 @@ Editor::paste_internal (nframes64_t position, float times)
        }
 }
 
-void
-Editor::paste_named_selection (float times)
-{
-       TrackSelection::iterator t;
-
-       Glib::RefPtr<TreeSelection> selected = named_selection_display.get_selection();
-
-       if (selected->count_selected_rows() != 1 || selection->tracks.empty()) {
-               return;
-       }
-
-       TreeModel::iterator i = selected->get_selected();
-       NamedSelection* ns = (*i)[named_selection_columns.selection];
-
-       list<boost::shared_ptr<Playlist> >::iterator chunk;
-       list<boost::shared_ptr<Playlist> >::iterator tmp;
-
-       chunk = ns->playlists.begin();
-
-       begin_reversible_command (_("paste chunk"));
-
-       sort_track_selection ();
-
-       for (t = selection->tracks.begin(); t != selection->tracks.end(); ++t) {
-
-               RouteTimeAxisView* rtv;
-               boost::shared_ptr<Playlist> pl;
-               boost::shared_ptr<AudioPlaylist> apl;
-
-               if ((rtv = dynamic_cast<RouteTimeAxisView*> (*t)) == 0) {
-                       continue;
-               }
-
-               if ((pl = rtv->playlist()) == 0) {
-                       continue;
-               }
-
-               if ((apl = boost::dynamic_pointer_cast<AudioPlaylist> (pl)) == 0) {
-                       continue;
-               }
-
-               tmp = chunk;
-               ++tmp;
-
-               XMLNode &before = apl->get_state();
-               apl->paste (*chunk, get_preferred_edit_position(), times);
-               session->add_command(new MementoCommand<AudioPlaylist>(*apl, &before, &apl->get_state()));
-
-               if (tmp != ns->playlists.end()) {
-                       chunk = tmp;
-               }
-       }
-
-       commit_reversible_command();
-}
-
 void
 Editor::duplicate_some_regions (RegionSelection& regions, float times)
 {
@@ -4406,6 +4322,9 @@ Editor::duplicate_some_regions (RegionSelection& regions, float times)
        RegionSelection sel = regions; // clear (below) may  clear the argument list if its the current region selection
        RegionSelection foo;
 
+       nframes_t const start_frame = regions.start ();
+       nframes_t const end_frame = regions.end_frame ();
+
        begin_reversible_command (_("duplicate region"));
 
        selection->clear_regions ();
@@ -4417,12 +4336,12 @@ Editor::duplicate_some_regions (RegionSelection& regions, float times)
                TimeAxisView& tv = (*i)->get_time_axis_view();
                RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (&tv);
                latest_regionviews.clear ();
-               sigc::connection c = rtv->view()->RegionViewAdded.connect (mem_fun(*this, &Editor::collect_new_region_view));
+               sigc::connection c = rtv->view()->RegionViewAdded.connect (sigc::mem_fun(*this, &Editor::collect_new_region_view));
 
                playlist = (*i)->region()->playlist();
                 XMLNode &before = playlist->get_state();
-               playlist->duplicate (r, r->last_frame(), times);
-               session->add_command(new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
+               playlist->duplicate (r, end_frame + (r->first_frame() - start_frame) + 1, times);
+               _session->add_command(new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
 
                c.disconnect ();
 
@@ -4464,7 +4383,7 @@ Editor::duplicate_selection (float times)
                XMLNode &before = playlist->get_state();
                playlist->duplicate (*ri, selection->time[clicked_selection].end, times);
                XMLNode &after = playlist->get_state();
-               session->add_command (new MementoCommand<Playlist>(*playlist, &before, &after));
+               _session->add_command (new MementoCommand<Playlist>(*playlist, &before, &after));
 
                ++ri;
                if (ri == new_regions.end()) {
@@ -4482,7 +4401,7 @@ Editor::reset_point_selection ()
 
        for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
 
-               AutomationTimeAxisView* atv = dynamic_cast<AutomationTimeAxisView*>(&(*i).track);
+               AutomationTimeAxisView* atv = dynamic_cast<AutomationTimeAxisView*>((*i).track);
 
                if (atv) {
                        atv->reset_objects (selection->points);
@@ -4511,7 +4430,7 @@ Editor::clear_playlist (boost::shared_ptr<Playlist> playlist)
         XMLNode &before = playlist->get_state();
        playlist->clear ();
         XMLNode &after = playlist->get_state();
-       session->add_command (new MementoCommand<Playlist>(*playlist.get(), &before, &after));
+       _session->add_command (new MementoCommand<Playlist>(*playlist.get(), &before, &after));
        commit_reversible_command ();
 }
 
@@ -4548,7 +4467,7 @@ Editor::nudge_track (bool use_edit, bool forwards)
                 XMLNode &before = playlist->get_state();
                playlist->nudge_after (start, distance, forwards);
                 XMLNode &after = playlist->get_state();
-               session->add_command (new MementoCommand<Playlist>(*playlist, &before, &after));
+               _session->add_command (new MementoCommand<Playlist>(*playlist, &before, &after));
        }
 
        commit_reversible_command ();
@@ -4560,7 +4479,7 @@ Editor::remove_last_capture ()
        vector<string> choices;
        string prompt;
 
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -4571,21 +4490,21 @@ Editor::remove_last_capture ()
                choices.push_back (_("No, do nothing."));
                choices.push_back (_("Yes, destroy it."));
 
-               Gtkmm2ext::Choice prompter (prompt, choices);
+               Gtkmm2ext::Choice prompter (_("Destroy last capture"), prompt, choices);
 
                if (prompter.run () == 1) {
-                       session->remove_last_capture ();
+                       _session->remove_last_capture ();
                }
 
        } else {
-               session->remove_last_capture();
+               _session->remove_last_capture();
        }
 }
 
 void
 Editor::normalize_region ()
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -4626,7 +4545,7 @@ Editor::normalize_region ()
                        continue;
                XMLNode &before = arv->region()->get_state();
                arv->audio_region()->normalize_to (spin.get_value());
-               session->add_command (new MementoCommand<Region>(*(arv->region().get()), &before, &arv->region()->get_state()));
+               _session->add_command (new MementoCommand<Region>(*(arv->region().get()), &before, &arv->region()->get_state()));
        }
 
        commit_reversible_command ();
@@ -4639,7 +4558,7 @@ Editor::normalize_region ()
 void
 Editor::reset_region_scale_amplitude ()
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -4659,7 +4578,7 @@ Editor::reset_region_scale_amplitude ()
                        continue;
                XMLNode &before = arv->region()->get_state();
                arv->audio_region()->set_scale_amplitude (1.0f);
-               session->add_command (new MementoCommand<Region>(*(arv->region().get()), &before, &arv->region()->get_state()));
+               _session->add_command (new MementoCommand<Region>(*(arv->region().get()), &before, &arv->region()->get_state()));
        }
 
        commit_reversible_command ();
@@ -4668,7 +4587,7 @@ Editor::reset_region_scale_amplitude ()
 void
 Editor::adjust_region_scale_amplitude (bool up)
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -4709,7 +4628,7 @@ Editor::adjust_region_scale_amplitude (bool up)
                }
 
                arv->audio_region()->set_scale_amplitude (fraction);
-               session->add_command (new MementoCommand<Region>(*(arv->region().get()), &before, &arv->region()->get_state()));
+               _session->add_command (new MementoCommand<Region>(*(arv->region().get()), &before, &arv->region()->get_state()));
        }
 
        commit_reversible_command ();
@@ -4719,18 +4638,18 @@ Editor::adjust_region_scale_amplitude (bool up)
 void
 Editor::reverse_region ()
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
-       Reverse rev (*session);
+       Reverse rev (*_session);
        apply_filter (rev, _("reverse regions"));
 }
 
 void
 Editor::strip_region_silence ()
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -4754,7 +4673,7 @@ Editor::strip_region_silence ()
        int const r = d.run ();
 
        if (r == Gtk::RESPONSE_OK) {
-               StripSilence s (*session, d.threshold (), d.minimum_length (), d.fade_length ());
+               StripSilence s (*_session, d.threshold (), d.minimum_length (), d.fade_length ());
                apply_filter (s, _("strip silence"));
        }
 }
@@ -4795,7 +4714,7 @@ Editor::apply_midi_note_edit_op (MidiOperator& op)
                        cmd = apply_midi_note_edit_op_to_region (op, *mrv);
                        if (cmd) {
                                (*cmd)();
-                               session->add_command (cmd);
+                               _session->add_command (cmd);
                        }
                }
 
@@ -4809,7 +4728,7 @@ Editor::apply_midi_note_edit_op (MidiOperator& op)
 void
 Editor::quantize_region ()
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -4820,7 +4739,7 @@ Editor::quantize_region ()
        qd->hide ();
 
        if (r == Gtk::RESPONSE_OK) {
-               Quantize quant (*session, Plain,
+               Quantize quant (*_session, Plain,
                                qd->snap_start(), qd->snap_end(),
                                qd->start_grid_size(), qd->end_grid_size(),
                                qd->strength(), qd->swing(), qd->threshold());
@@ -4879,7 +4798,7 @@ Editor::apply_filter (Filter& filter, string command)
                                }
 
                                XMLNode &after = playlist->get_state();
-                               session->add_command(new MementoCommand<Playlist>(*playlist, &before, &after));
+                               _session->add_command(new MementoCommand<Playlist>(*playlist, &before, &after));
                        } else {
                                goto out;
                        }
@@ -4953,11 +4872,11 @@ Editor::reset_region_gain_envelopes ()
 {
        RegionSelection rs = get_equivalent_regions (selection->regions, RouteGroup::Edit);
 
-       if (!session || rs.empty()) {
+       if (!_session || rs.empty()) {
                return;
        }
 
-       session->begin_reversible_command (_("reset region gain"));
+       _session->begin_reversible_command (_("reset region gain"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*i);
@@ -4966,11 +4885,11 @@ Editor::reset_region_gain_envelopes ()
                        XMLNode& before (alist->get_state());
 
                        arv->audio_region()->set_default_envelope ();
-                       session->add_command (new MementoCommand<AutomationList>(*arv->audio_region()->envelope().get(), &before, &alist->get_state()));
+                       _session->add_command (new MementoCommand<AutomationList>(*arv->audio_region()->envelope().get(), &before, &alist->get_state()));
                }
        }
 
-       session->commit_reversible_command ();
+       _session->commit_reversible_command ();
 }
 
 void
@@ -4978,11 +4897,11 @@ Editor::toggle_gain_envelope_visibility ()
 {
        RegionSelection rs = get_equivalent_regions (selection->regions, RouteGroup::Edit);
 
-       if (!session || rs.empty()) {
+       if (!_session || rs.empty()) {
                return;
        }
 
-       session->begin_reversible_command (_("region gain envelope visible"));
+       _session->begin_reversible_command (_("region gain envelope visible"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*i);
@@ -4990,11 +4909,11 @@ Editor::toggle_gain_envelope_visibility ()
                        XMLNode &before = arv->region()->get_state ();
                        arv->set_envelope_visible (!arv->envelope_visible());
                        XMLNode &after = arv->region()->get_state ();
-                       session->add_command (new MementoCommand<Region> (*(arv->region().get()), &before, &after));
+                       _session->add_command (new MementoCommand<Region> (*(arv->region().get()), &before, &after));
                }
        }
 
-       session->commit_reversible_command ();
+       _session->commit_reversible_command ();
 }
 
 void
@@ -5002,11 +4921,11 @@ Editor::toggle_gain_envelope_active ()
 {
        RegionSelection rs = get_equivalent_regions (selection->regions, RouteGroup::Edit);
 
-       if (!session || rs.empty()) {
+       if (!_session || rs.empty()) {
                return;
        }
 
-       session->begin_reversible_command (_("region gain envelope active"));
+       _session->begin_reversible_command (_("region gain envelope active"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*i);
@@ -5014,11 +4933,11 @@ Editor::toggle_gain_envelope_active ()
                        XMLNode &before = arv->region()->get_state ();
                        arv->audio_region()->set_envelope_active (!arv->audio_region()->envelope_active());
                        XMLNode &after = arv->region()->get_state ();
-                       session->add_command (new MementoCommand<Region> (*(arv->region().get()), &before, &after));
+                       _session->add_command (new MementoCommand<Region> (*(arv->region().get()), &before, &after));
                }
        }
 
-       session->commit_reversible_command ();
+       _session->commit_reversible_command ();
 }
 
 void
@@ -5026,20 +4945,20 @@ Editor::toggle_region_lock ()
 {
        RegionSelection rs = get_equivalent_regions (selection->regions, RouteGroup::Edit);
 
-       if (!session || rs.empty()) {
+       if (!_session || rs.empty()) {
                return;
        }
 
-       session->begin_reversible_command (_("region lock"));
+       _session->begin_reversible_command (_("region lock"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                XMLNode &before = (*i)->region()->get_state ();
                (*i)->region()->set_locked (!(*i)->region()->locked());
                XMLNode &after = (*i)->region()->get_state ();
-               session->add_command (new MementoCommand<Region> (*((*i)->region().get()), &before, &after));
+               _session->add_command (new MementoCommand<Region> (*((*i)->region().get()), &before, &after));
        }
 
-       session->commit_reversible_command ();
+       _session->commit_reversible_command ();
 }
 
 void
@@ -5047,20 +4966,20 @@ Editor::set_region_lock_style (Region::PositionLockStyle ps)
 {
        RegionSelection rs = get_equivalent_regions (selection->regions, RouteGroup::Edit);
 
-       if (!session || rs.empty()) {
+       if (!_session || rs.empty()) {
                return;
        }
 
-       session->begin_reversible_command (_("region lock style"));
+       _session->begin_reversible_command (_("region lock style"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                XMLNode &before = (*i)->region()->get_state ();
                (*i)->region()->set_position_lock_style (ps);
                XMLNode &after = (*i)->region()->get_state ();
-               session->add_command (new MementoCommand<Region> (*((*i)->region().get()), &before, &after));
+               _session->add_command (new MementoCommand<Region> (*((*i)->region().get()), &before, &after));
        }
 
-       session->commit_reversible_command ();
+       _session->commit_reversible_command ();
 }
 
 
@@ -5069,20 +4988,20 @@ Editor::toggle_region_mute ()
 {
        RegionSelection rs = get_equivalent_regions (selection->regions, RouteGroup::Edit);
 
-       if (!session || rs.empty()) {
+       if (!_session || rs.empty()) {
                return;
        }
 
-       session->begin_reversible_command (_("region mute"));
+       _session->begin_reversible_command (_("region mute"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                XMLNode &before = (*i)->region()->get_state ();
                (*i)->region()->set_muted (!(*i)->region()->muted());
                XMLNode &after = (*i)->region()->get_state ();
-               session->add_command (new MementoCommand<Region> (*((*i)->region().get()), &before, &after));
+               _session->add_command (new MementoCommand<Region> (*((*i)->region().get()), &before, &after));
        }
 
-       session->commit_reversible_command ();
+       _session->commit_reversible_command ();
 }
 
 void
@@ -5090,20 +5009,20 @@ Editor::toggle_region_opaque ()
 {
        RegionSelection rs = get_equivalent_regions (selection->regions, RouteGroup::Edit);
 
-       if (!session || rs.empty()) {
+       if (!_session || rs.empty()) {
                return;
        }
 
-       session->begin_reversible_command (_("region opacity"));
+       _session->begin_reversible_command (_("region opacity"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                XMLNode &before = (*i)->region()->get_state ();
                (*i)->region()->set_opaque (!(*i)->region()->opaque());
                XMLNode &after = (*i)->region()->get_state ();
-               session->add_command (new MementoCommand<Region> (*((*i)->region().get()), &before, &after));
+               _session->add_command (new MementoCommand<Region> (*((*i)->region().get()), &before, &after));
        }
 
-       session->commit_reversible_command ();
+       _session->commit_reversible_command ();
 }
 
 void
@@ -5195,7 +5114,7 @@ Editor::set_fade_length (bool in)
                }
 
                XMLNode &after = alist->get_state();
-               session->add_command(new MementoCommand<AutomationList>(*alist, &before, &after));
+               _session->add_command(new MementoCommand<AutomationList>(*alist, &before, &after));
        }
 
        commit_reversible_command ();
@@ -5245,7 +5164,7 @@ Editor::toggle_fade_active (bool in)
                        region->set_fade_out_active (!yn);
                }
                XMLNode &after = region->get_state();
-               session->add_command(new MementoCommand<AudioRegion>(*region.get(), &before, &after));
+               _session->add_command(new MementoCommand<AudioRegion>(*region.get(), &before, &after));
        }
 
        commit_reversible_command ();
@@ -5277,7 +5196,7 @@ Editor::set_fade_in_shape (AudioRegion::FadeShape shape)
                tmp->audio_region()->set_fade_in_shape (shape);
 
                XMLNode &after = alist->get_state();
-               session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &after));
+               _session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &after));
        }
 
        commit_reversible_command ();
@@ -5310,7 +5229,7 @@ Editor::set_fade_out_shape (AudioRegion::FadeShape shape)
                tmp->audio_region()->set_fade_out_shape (shape);
 
                XMLNode &after = alist->get_state();
-               session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &after));
+               _session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &after));
        }
 
        commit_reversible_command ();
@@ -5344,7 +5263,7 @@ Editor::set_fade_in_active (bool yn)
                ar->set_fade_in_active (yn);
 
                XMLNode &after = ar->get_state();
-               session->add_command(new MementoCommand<AudioRegion>(*ar, &before, &after));
+               _session->add_command(new MementoCommand<AudioRegion>(*ar, &before, &after));
        }
 
        commit_reversible_command ();
@@ -5377,7 +5296,7 @@ Editor::set_fade_out_active (bool yn)
                ar->set_fade_out_active (yn);
 
                XMLNode &after = ar->get_state();
-               session->add_command(new MementoCommand<AudioRegion>(*ar, &before, &after));
+               _session->add_command(new MementoCommand<AudioRegion>(*ar, &before, &after));
        }
 
        commit_reversible_command ();
@@ -5433,7 +5352,7 @@ Editor::toggle_selected_region_fades (int dir)
 void
 Editor::update_region_fade_visibility ()
 {
-       bool _fade_visibility = session->config.get_show_region_fades ();
+       bool _fade_visibility = _session->config.get_show_region_fades ();
 
        for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
                AudioTimeAxisView* v = dynamic_cast<AudioTimeAxisView*>(*i);
@@ -5451,7 +5370,7 @@ Editor::update_region_fade_visibility ()
 void
 Editor::update_xfade_visibility ()
 {
-       _xfade_visibility = session->config.get_xfades_visible ();
+       _xfade_visibility = _session->config.get_xfades_visible ();
 
        for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
                AudioTimeAxisView* v = dynamic_cast<AudioTimeAxisView*>(*i);
@@ -5496,7 +5415,7 @@ void
 Editor::set_playhead_cursor ()
 {
        if (entered_marker) {
-               session->request_locate (entered_marker->position(), session->transport_rolling());
+               _session->request_locate (entered_marker->position(), _session->transport_rolling());
        } else {
                nframes64_t where;
                bool ignored;
@@ -5507,8 +5426,8 @@ Editor::set_playhead_cursor ()
 
                snap_to (where);
 
-               if (session) {
-                       session->request_locate (where, session->transport_rolling());
+               if (_session) {
+                       _session->request_locate (where, _session->transport_rolling());
                }
        }
 }
@@ -5650,7 +5569,7 @@ Editor::ensure_track_visible(TimeAxisView *track)
 void
 Editor::set_loop_from_selection (bool play)
 {
-       if (session == 0 || selection->time.empty()) {
+       if (_session == 0 || selection->time.empty()) {
                return;
        }
 
@@ -5660,15 +5579,15 @@ Editor::set_loop_from_selection (bool play)
        set_loop_range (start, end,  _("set loop range from selection"));
 
        if (play) {
-               session->request_play_loop (true);
-               session->request_locate (start, true);
+               _session->request_play_loop (true);
+               _session->request_locate (start, true);
        }
 }
 
 void
 Editor::set_loop_from_edit_range (bool play)
 {
-       if (session == 0) {
+       if (_session == 0) {
                return;
        }
 
@@ -5682,8 +5601,8 @@ Editor::set_loop_from_edit_range (bool play)
        set_loop_range (start, end,  _("set loop range from edit range"));
 
        if (play) {
-               session->request_play_loop (true);
-               session->request_locate (start, true);
+               _session->request_play_loop (true);
+               _session->request_locate (start, true);
        }
 }
 
@@ -5713,15 +5632,15 @@ Editor::set_loop_from_region (bool play)
        set_loop_range (start, end, _("set loop range from region"));
 
        if (play) {
-               session->request_play_loop (true);
-               session->request_locate (start, true);
+               _session->request_play_loop (true);
+               _session->request_locate (start, true);
        }
 }
 
 void
 Editor::set_punch_from_selection ()
 {
-       if (session == 0 || selection->time.empty()) {
+       if (_session == 0 || selection->time.empty()) {
                return;
        }
 
@@ -5734,7 +5653,7 @@ Editor::set_punch_from_selection ()
 void
 Editor::set_punch_from_edit_range ()
 {
-       if (session == 0) {
+       if (_session == 0) {
                return;
        }
 
@@ -5791,7 +5710,7 @@ Editor::pitch_shift_regions ()
 void
 Editor::use_region_as_bar ()
 {
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -5822,7 +5741,7 @@ Editor::define_one_bar (nframes64_t start, nframes64_t end)
 {
        nframes64_t length = end - start;
 
-       const Meter& m (session->tempo_map().meter_at (start));
+       const Meter& m (_session->tempo_map().meter_at (start));
 
        /* length = 1 bar */
 
@@ -5834,7 +5753,7 @@ Editor::define_one_bar (nframes64_t start, nframes64_t end)
 
        /* beats per minute = */
 
-       double beats_per_minute = (session->frame_rate() * 60.0) / frames_per_beat;
+       double beats_per_minute = (_session->frame_rate() * 60.0) / frames_per_beat;
 
        /* now decide whether to:
 
@@ -5843,11 +5762,11 @@ Editor::define_one_bar (nframes64_t start, nframes64_t end)
 
        */
 
-       const TempoSection& t (session->tempo_map().tempo_section_at (start));
+       const TempoSection& t (_session->tempo_map().tempo_section_at (start));
 
        bool do_global = false;
 
-       if ((session->tempo_map().n_tempos() == 1) && (session->tempo_map().n_meters() == 1)) {
+       if ((_session->tempo_map().n_tempos() == 1) && (_session->tempo_map().n_meters() == 1)) {
 
                /* only 1 tempo & 1 meter: ask if the user wants to set the tempo
                   at the start, or create a new marker
@@ -5857,8 +5776,13 @@ Editor::define_one_bar (nframes64_t start, nframes64_t end)
                options.push_back (_("Cancel"));
                options.push_back (_("Add new marker"));
                options.push_back (_("Set global tempo"));
-               Choice c (_("Do you want to set the global tempo or add new tempo marker?"),
-                         options);
+
+               Choice c (
+                       _("Define one bar"),
+                       _("Do you want to set the global tempo or add a new tempo marker?"),
+                       options
+                       );
+               
                c.set_default_response (2);
 
                switch (c.run()) {
@@ -5882,19 +5806,19 @@ Editor::define_one_bar (nframes64_t start, nframes64_t end)
        }
 
        begin_reversible_command (_("set tempo from region"));
-       XMLNode& before (session->tempo_map().get_state());
+       XMLNode& before (_session->tempo_map().get_state());
 
        if (do_global) {
-               session->tempo_map().change_initial_tempo (beats_per_minute, t.note_type());
+               _session->tempo_map().change_initial_tempo (beats_per_minute, t.note_type());
        } else if (t.frame() == start) {
-               session->tempo_map().change_existing_tempo_at (start, beats_per_minute, t.note_type());
+               _session->tempo_map().change_existing_tempo_at (start, beats_per_minute, t.note_type());
        } else {
-               session->tempo_map().add_tempo (Tempo (beats_per_minute, t.note_type()), start);
+               _session->tempo_map().add_tempo (Tempo (beats_per_minute, t.note_type()), start);
        }
 
-       XMLNode& after (session->tempo_map().get_state());
+       XMLNode& after (_session->tempo_map().get_state());
 
-       session->add_command (new MementoCommand<TempoMap>(session->tempo_map(), &before, &after));
+       _session->add_command (new MementoCommand<TempoMap>(_session->tempo_map(), &before, &after));
        commit_reversible_command ();
 }
 
@@ -5903,7 +5827,7 @@ Editor::split_region_at_transients ()
 {
        AnalysisFeatureList positions;
 
-       if (!session) {
+       if (!_session) {
                return;
        }
 
@@ -5915,7 +5839,7 @@ Editor::split_region_at_transients ()
                return;
        }
 
-       session->begin_reversible_command (_("split regions"));
+       _session->begin_reversible_command (_("split regions"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ) {
 
@@ -5934,7 +5858,7 @@ Editor::split_region_at_transients ()
                i = tmp;
        }
 
-       session->commit_reversible_command ();
+       _session->commit_reversible_command ();
 
 }
 
@@ -6033,7 +5957,7 @@ Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList
 
                string new_name;
 
-               if (session->region_name (new_name, r->name())) {
+               if (_session->region_name (new_name, r->name())) {
                        break;
                }
 
@@ -6063,7 +5987,7 @@ Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList
 
        XMLNode& after (pl->get_state());
 
-       session->add_command (new MementoCommand<Playlist>(*pl, &before, &after));
+       _session->add_command (new MementoCommand<Playlist>(*pl, &before, &after));
 }
 
 void
@@ -6071,11 +5995,11 @@ Editor::tab_to_transient (bool forward)
 {
        AnalysisFeatureList positions;
 
-       if (!session) {
+       if (!_session) {
                return;
        }
 
-       nframes64_t pos = session->audible_frame ();
+       nframes64_t pos = _session->audible_frame ();
 
        if (!selection->tracks.empty()) {
 
@@ -6113,7 +6037,7 @@ Editor::tab_to_transient (bool forward)
                }
        }
 
-       TransientDetector::cleanup_transients (positions, session->frame_rate(), 3.0);
+       TransientDetector::cleanup_transients (positions, _session->frame_rate(), 3.0);
 
        if (forward) {
                AnalysisFeatureList::iterator x;
@@ -6125,7 +6049,7 @@ Editor::tab_to_transient (bool forward)
                }
 
                if (x != positions.end ()) {
-                       session->request_locate (*x);
+                       _session->request_locate (*x);
                }
 
        } else {
@@ -6138,19 +6062,19 @@ Editor::tab_to_transient (bool forward)
                }
 
                if (x != positions.rend ()) {
-                       session->request_locate (*x);
+                       _session->request_locate (*x);
                }
        }
 }
 void
 Editor::playhead_forward_to_grid ()
 {
-       if (!session) return;
+       if (!_session) return;
        nframes64_t pos = playhead_cursor->current_frame;
        if (pos < max_frames - 1) {
                pos += 2;
                snap_to_internal (pos, 1, false);
-               session->request_locate (pos);
+               _session->request_locate (pos);
        }
 }
 
@@ -6158,12 +6082,12 @@ Editor::playhead_forward_to_grid ()
 void
 Editor::playhead_backward_to_grid ()
 {
-       if (!session) return;
+       if (!_session) return;
        nframes64_t pos = playhead_cursor->current_frame;
        if (pos > 2) {
                pos -= 2;
                snap_to_internal (pos, -1, false);
-               session->request_locate (pos);
+               _session->request_locate (pos);
        }
 }
 
@@ -6270,14 +6194,21 @@ Editor::remove_tracks ()
                choices.push_back (_("Yes, remove it."));
        }
 
-       Choice prompter (prompt, choices);
+       string title;
+       if (ntracks) {
+               title = string_compose (_("Remove %1"), trackstr);
+       } else {
+               title = string_compose (_("Remove %1"), busstr);
+       }
+
+       Choice prompter (title, prompt, choices);
 
        if (prompter.run () != 1) {
                return;
        }
 
        for (vector<boost::shared_ptr<Route> >::iterator x = routes.begin(); x != routes.end(); ++x) {
-               session->remove_route (*x);
+               _session->remove_route (*x);
        }
 }
 
@@ -6301,9 +6232,9 @@ Editor::do_insert_time ()
        Label time_label (_("Time to insert:"));
        time_label.set_alignment (1, 0.5);
        table.attach (time_label, 0, 1, 0, 1, FILL | EXPAND);
-       AudioClock clock ("insertTimeClock", true, X_("InsertTimeClock"), true, true, true);
+       AudioClock clock ("insertTimeClock", true, X_("InsertTimeClock"), true, false, true, true);
        clock.set (0);
-       clock.set_session (session);
+       clock.set_session (_session);
        clock.set_bbt_reference (pos);
        table.attach (clock, 1, 2, 0, 1);
 
@@ -6387,7 +6318,7 @@ Editor::insert_time (nframes64_t pos, nframes64_t frames, InsertTimeOption opt,
 
                        XMLNode &after = pl->get_state();
 
-                       session->add_command (new MementoCommand<Playlist> (*pl, &before, &after));
+                       _session->add_command (new MementoCommand<Playlist> (*pl, &before, &after));
                        commit = true;
                }
 
@@ -6402,8 +6333,8 @@ Editor::insert_time (nframes64_t pos, nframes64_t frames, InsertTimeOption opt,
        /* markers */
        if (markers_too) {
                bool moved = false;
-               XMLNode& before (session->locations()->get_state());
-               Locations::LocationList copy (session->locations()->list());
+               XMLNode& before (_session->locations()->get_state());
+               Locations::LocationList copy (_session->locations()->list());
 
                for (Locations::LocationList::iterator i = copy.begin(); i != copy.end(); ++i) {
 
@@ -6419,13 +6350,13 @@ Editor::insert_time (nframes64_t pos, nframes64_t frames, InsertTimeOption opt,
                }
 
                if (moved) {
-                       XMLNode& after (session->locations()->get_state());
-                       session->add_command (new MementoCommand<Locations>(*session->locations(), &before, &after));
+                       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);
+               _session->tempo_map().insert_time (pos, frames);
        }
 
        if (commit) {
@@ -6440,7 +6371,7 @@ Editor::fit_selected_tracks ()
 }
 
 void
-Editor::fit_tracks (TrackSelection & tracks)
+Editor::fit_tracks (TrackViewList & tracks)
 {
        if (tracks.empty()) {
                return;
@@ -6542,7 +6473,7 @@ void
 Editor::start_visual_state_op (uint32_t n)
 {
        if (visual_state_op_connection.empty()) {
-               visual_state_op_connection = Glib::signal_timeout().connect (bind (mem_fun (*this, &Editor::end_visual_state_op), n), 1000);
+               visual_state_op_connection = Glib::signal_timeout().connect (sigc::bind (sigc::mem_fun (*this, &Editor::end_visual_state_op), n), 1000);
        }
 }