[Summary] Just adding comment for better code-maintaining.
[ardour.git] / gtk2_ardour / midi_region_view.cc
index 70898c4cfd0d5af311130bb54f1e20a18caaa632..47e5510664991640a478817f41e9bd8feac063a2 100644 (file)
@@ -33,6 +33,7 @@
 #include "pbd/stateful_diff_command.h"
 
 #include "ardour/midi_model.h"
+#include "ardour/midi_playlist.h"
 #include "ardour/midi_region.h"
 #include "ardour/midi_source.h"
 #include "ardour/midi_track.h"
@@ -103,6 +104,7 @@ MidiRegionView::MidiRegionView (ArdourCanvas::Container*      parent,
        , _current_range_max(0)
        , _region_relative_time_converter(r->session().tempo_map(), r->position())
        , _source_relative_time_converter(r->session().tempo_map(), r->position() - r->start())
+       , _region_relative_time_converter_double(r->session().tempo_map(), r->position())
        , _active_notes(0)
        , _note_group (new ArdourCanvas::Container (group))
        , _note_diff_command (0)
@@ -118,10 +120,12 @@ MidiRegionView::MidiRegionView (ArdourCanvas::Container*      parent,
        , _optimization_iterator (_events.end())
        , _list_editor (0)
        , _no_sound_notes (false)
+       , _last_display_zoom (0)
        , _last_event_x (0)
        , _last_event_y (0)
        , _grabbed_keyboard (false)
        , _entered (false)
+       , _mouse_changed_selection (false)
 {
        CANVAS_DEBUG_NAME (_note_group, string_compose ("note group for %1", get_item_name()));
        _note_group->raise_to_top();
@@ -148,8 +152,9 @@ MidiRegionView::MidiRegionView (ArdourCanvas::Container*      parent,
        , _current_range_max(0)
        , _region_relative_time_converter(r->session().tempo_map(), r->position())
        , _source_relative_time_converter(r->session().tempo_map(), r->position() - r->start())
+       , _region_relative_time_converter_double(r->session().tempo_map(), r->position())
        , _active_notes(0)
-       , _note_group (new ArdourCanvas::Container (parent))
+       , _note_group (new ArdourCanvas::Container (group))
        , _note_diff_command (0)
        , _ghost_note(0)
        , _step_edit_cursor (0)
@@ -163,10 +168,12 @@ MidiRegionView::MidiRegionView (ArdourCanvas::Container*      parent,
        , _optimization_iterator (_events.end())
        , _list_editor (0)
        , _no_sound_notes (false)
+       , _last_display_zoom (0)
        , _last_event_x (0)
        , _last_event_y (0)
        , _grabbed_keyboard (false)
        , _entered (false)
+       , _mouse_changed_selection (false)
 {
        CANVAS_DEBUG_NAME (_note_group, string_compose ("note group for %1", get_item_name()));
        _note_group->raise_to_top();
@@ -198,6 +205,7 @@ MidiRegionView::MidiRegionView (const MidiRegionView& other)
        , _current_range_max(0)
        , _region_relative_time_converter(other.region_relative_time_converter())
        , _source_relative_time_converter(other.source_relative_time_converter())
+       , _region_relative_time_converter_double(other.region_relative_time_converter_double())
        , _active_notes(0)
        , _note_group (new ArdourCanvas::Container (get_canvas_group()))
        , _note_diff_command (0)
@@ -213,10 +221,12 @@ MidiRegionView::MidiRegionView (const MidiRegionView& other)
        , _optimization_iterator (_events.end())
        , _list_editor (0)
        , _no_sound_notes (false)
+       , _last_display_zoom (0)
        , _last_event_x (0)
        , _last_event_y (0)
        , _grabbed_keyboard (false)
        , _entered (false)
+       , _mouse_changed_selection (false)
 {
        init (false);
 }
@@ -227,6 +237,7 @@ MidiRegionView::MidiRegionView (const MidiRegionView& other, boost::shared_ptr<M
        , _current_range_max(0)
        , _region_relative_time_converter(other.region_relative_time_converter())
        , _source_relative_time_converter(other.source_relative_time_converter())
+       , _region_relative_time_converter_double(other.region_relative_time_converter_double())
        , _active_notes(0)
        , _note_group (new ArdourCanvas::Container (get_canvas_group()))
        , _note_diff_command (0)
@@ -242,10 +253,12 @@ MidiRegionView::MidiRegionView (const MidiRegionView& other, boost::shared_ptr<M
        , _optimization_iterator (_events.end())
        , _list_editor (0)
        , _no_sound_notes (false)
+       , _last_display_zoom (0)
        , _last_event_x (0)
        , _last_event_y (0)
        , _grabbed_keyboard (false)
        , _entered (false)
+       , _mouse_changed_selection (false)
 {
        init (true);
 }
@@ -290,7 +303,7 @@ MidiRegionView::init (bool wfd)
 
        group->raise_to_top();
 
-       midi_view()->midi_track()->PlaybackChannelModeChanged.connect (_channel_mode_changed_connection, invalidator (*this),
+       midi_view()->midi_track()->playback_filter().ChannelModeChanged.connect (_channel_mode_changed_connection, invalidator (*this),
                                                                       boost::bind (&MidiRegionView::midi_channel_mode_changed, this),
                                                                       gui_context ());
 
@@ -382,7 +395,6 @@ MidiRegionView::canvas_group_event(GdkEvent* ev)
 
        case GDK_BUTTON_RELEASE:
                r = button_release (&ev->button);
-               _note_player.reset();
                return r;
 
        case GDK_MOTION_NOTIFY:
@@ -498,6 +510,7 @@ MidiRegionView::button_press (GdkEventButton* ev)
        }
 
        _pressed_button = ev->button;
+       _mouse_changed_selection = false;
 
        return true;
 }
@@ -528,12 +541,14 @@ MidiRegionView::button_release (GdkEventButton* ev)
                case MouseRange:
                        /* no motion occured - simple click */
                        clear_selection ();
+                       _mouse_changed_selection = true;
                        break;
 
                case MouseContent:
                case MouseTimeFX:
                        {
                                clear_selection();
+                               _mouse_changed_selection = true;
 
                                if (Keyboard::is_insert_note_event(ev)) {
 
@@ -543,12 +558,12 @@ MidiRegionView::button_release (GdkEventButton* ev)
                                        event_y = ev->y;
                                        group->canvas_to_item (event_x, event_y);
 
-                                       Evoral::MusicalTime beats = get_grid_beats(editor.pixel_to_sample(event_x));
+                                       Evoral::Beats beats = get_grid_beats(editor.pixel_to_sample(event_x));
 
                                        /* Shorten the length by 1 tick so that we can add a new note at the next
                                           grid snap without it overlapping this one.
                                        */
-                                       beats -= Evoral::MusicalTime::tick();
+                                       beats -= Evoral::Beats::tick();
 
                                        create_note_at (editor.pixel_to_sample (event_x), event_y, beats, true);
                                }
@@ -557,12 +572,12 @@ MidiRegionView::button_release (GdkEventButton* ev)
                        }
                case MouseDraw:
                        {
-                               Evoral::MusicalTime beats = get_grid_beats(editor.pixel_to_sample(event_x));
+                               Evoral::Beats beats = get_grid_beats(editor.pixel_to_sample(event_x));
 
                                /* Shorten the length by 1 tick so that we can add a new note at the next
                                   grid snap without it overlapping this one.
                                */
-                               beats -= Evoral::MusicalTime::tick();
+                               beats -= Evoral::Beats::tick();
                                
                                create_note_at (editor.pixel_to_sample (event_x), event_y, beats, true);
 
@@ -587,6 +602,11 @@ MidiRegionView::button_release (GdkEventButton* ev)
                break;
        }
 
+       if (_mouse_changed_selection) {
+               trackview.editor().begin_reversible_selection_op (X_("Mouse Selection Change"));
+               trackview.editor().commit_reversible_selection_op ();
+       }
+
        return false;
 }
 
@@ -639,6 +659,7 @@ MidiRegionView::motion (GdkEventMotion* ev)
                                editor.drags()->set (new MidiRubberbandSelectDrag (dynamic_cast<Editor *> (&editor), this), (GdkEvent *) ev);
                                if (!Keyboard::modifier_state_equals (ev->state, Keyboard::TertiaryModifier)) {
                                        clear_selection ();
+                                       _mouse_changed_selection = true;
                                }
                                _mouse_state = SelectRectDragging;
                                return true;
@@ -721,14 +742,14 @@ MidiRegionView::key_press (GdkEventKey* ev)
                clear_selection();
                _mouse_state = None;
 
-       } else if (unmodified && (ev->keyval == GDK_comma || ev->keyval == GDK_period)) {
+       } else if (ev->keyval == GDK_comma || ev->keyval == GDK_period) {
 
                bool start = (ev->keyval == GDK_comma);
                bool end = (ev->keyval == GDK_period);
                bool shorter = Keyboard::modifier_state_contains (ev->state, Keyboard::PrimaryModifier);
                bool fine = Keyboard::modifier_state_contains (ev->state, Keyboard::SecondaryModifier);
 
-               change_note_lengths (fine, shorter, Evoral::MusicalTime(), start, end);
+               change_note_lengths (fine, shorter, Evoral::Beats(), start, end);
 
                return true;
 
@@ -741,27 +762,19 @@ MidiRegionView::key_press (GdkEventKey* ev)
                delete_selection();
                return true;
 
-       } else if (ev->keyval == GDK_Tab) {
-
-               if (Keyboard::modifier_state_contains (ev->state, Keyboard::PrimaryModifier)) {
-                       goto_previous_note (Keyboard::modifier_state_contains (ev->state, Keyboard::TertiaryModifier));
-               } else {
-                       goto_next_note (Keyboard::modifier_state_contains (ev->state, Keyboard::TertiaryModifier));
-               }
-               return true;
-
-       } else if (ev->keyval == GDK_ISO_Left_Tab) {
+       } else if (ev->keyval == GDK_Tab || ev->keyval == GDK_ISO_Left_Tab) {
 
-               /* Shift-TAB generates ISO Left Tab, for some reason */
+               trackview.editor().begin_reversible_selection_op (X_("Select Adjacent Note"));
 
                if (Keyboard::modifier_state_contains (ev->state, Keyboard::PrimaryModifier)) {
                        goto_previous_note (Keyboard::modifier_state_contains (ev->state, Keyboard::TertiaryModifier));
                } else {
                        goto_next_note (Keyboard::modifier_state_contains (ev->state, Keyboard::TertiaryModifier));
                }
-               return true;
 
+               trackview.editor().commit_reversible_selection_op();
 
+               return true;
 
        } else if (ev->keyval == GDK_Up) {
 
@@ -911,7 +924,7 @@ MidiRegionView::show_list_editor ()
  * \param snap_t true to snap t to the grid, otherwise false.
  */
 void
-MidiRegionView::create_note_at (framepos_t t, double y, Evoral::MusicalTime length, bool snap_t)
+MidiRegionView::create_note_at (framepos_t t, double y, Evoral::Beats length, bool snap_t)
 {
        if (length < 2 * DBL_EPSILON) {
                return;
@@ -942,9 +955,12 @@ MidiRegionView::create_note_at (framepos_t t, double y, Evoral::MusicalTime leng
 
        view->update_note_range(new_note->note());
 
-       MidiModel::NoteDiffCommand* cmd = _model->new_note_diff_command(_("add note"));
-       cmd->add (new_note);
-       _model->apply_command(*trackview.session(), cmd);
+       start_note_diff_command(_("add note"));
+
+       clear_selection ();
+       note_diff_add_note (new_note, true, false);
+
+       apply_diff();
 
        play_midi_note (new_note);
 }
@@ -978,8 +994,8 @@ MidiRegionView::display_model(boost::shared_ptr<MidiModel> model)
 
        content_connection.disconnect ();
        _model->ContentsChanged.connect (content_connection, invalidator (*this), boost::bind (&MidiRegionView::redisplay_model, this), gui_context());
-
-       clear_events ();
+       /* Don't signal as nobody else needs to know until selection has been altered. */
+       clear_events (false);
 
        if (_enable_display) {
                redisplay_model();
@@ -990,6 +1006,7 @@ void
 MidiRegionView::start_note_diff_command (string name)
 {
        if (!_note_diff_command) {
+               trackview.editor().begin_reversible_command (name);
                _note_diff_command = _model->new_note_diff_command (name);
        }
 }
@@ -1029,7 +1046,7 @@ MidiRegionView::note_diff_add_change (NoteBase* ev,
 void
 MidiRegionView::note_diff_add_change (NoteBase* ev,
                                       MidiModel::NoteDiffCommand::Property property,
-                                      Evoral::MusicalTime val)
+                                      Evoral::Beats val)
 {
        if (_note_diff_command) {
                _note_diff_command->change (ev->note(), property, val);
@@ -1040,6 +1057,7 @@ void
 MidiRegionView::apply_diff (bool as_subcommand)
 {
        bool add_or_remove;
+       bool commit = false;
 
        if (!_note_diff_command) {
                return;
@@ -1052,20 +1070,26 @@ MidiRegionView::apply_diff (bool as_subcommand)
                }
        }
 
+       midi_view()->midi_track()->midi_playlist()->region_edited(
+               _region, _note_diff_command);
+
        if (as_subcommand) {
                _model->apply_command_as_subcommand (*trackview.session(), _note_diff_command);
        } else {
                _model->apply_command (*trackview.session(), _note_diff_command);
+               commit = true;
        }
 
        _note_diff_command = 0;
-       midi_view()->midi_track()->playlist_modified();
 
        if (add_or_remove) {
                _marked_for_selection.clear();
        }
 
        _marked_for_velocity.clear();
+       if (commit) {
+               trackview.editor().commit_reversible_command ();
+       }
 }
 
 void
@@ -1096,8 +1120,23 @@ MidiRegionView::find_canvas_note (boost::shared_ptr<NoteType> note)
        return 0;
 }
 
+/** This version finds any canvas note matching the supplied note. */
+NoteBase*
+MidiRegionView::find_canvas_note (NoteType note)
+{
+       Events::iterator it;
+
+       for (it = _events.begin(); it != _events.end(); ++it) {
+               if (*((*it)->note()) == note) {
+                       return *it;
+               }
+       }
+
+       return 0;
+}
+
 void
-MidiRegionView::get_events (Events& e, Evoral::Sequence<Evoral::MusicalTime>::NoteOperator op, uint8_t val, int chan_mask)
+MidiRegionView::get_events (Events& e, Evoral::Sequence<Evoral::Beats>::NoteOperator op, uint8_t val, int chan_mask)
 {
        MidiModel::Notes notes;
        _model->get_notes (notes, op, val, chan_mask);
@@ -1114,10 +1153,18 @@ void
 MidiRegionView::redisplay_model()
 {
        if (_active_notes) {
-               /* Recording, so just update canvas events to reflect changes
-                  in zoom or whatever without touching model. */
-               for (Events::iterator i = _events.begin(); i != _events.end(); ++i) {
-                       update_note(*i);
+               // Currently recording
+               const framecnt_t zoom = trackview.editor().get_current_zoom();
+               if (zoom != _last_display_zoom) {
+                       /* Update resolved canvas notes to reflect changes in zoom without
+                          touching model.  Leave active notes (with length 0) alone since
+                          they are being extended. */
+                       for (Events::iterator i = _events.begin(); i != _events.end(); ++i) {
+                               if ((*i)->note()->length() > 0) {
+                                       update_note(*i);
+                               }
+                       }
+                       _last_display_zoom = zoom;
                }
                return;
        }
@@ -1158,7 +1205,14 @@ MidiRegionView::redisplay_model()
 
                        } else {
 
-                               add_note (note, visible);
+                               cne = add_note (note, visible);
+                       }
+
+                       set<boost::shared_ptr<NoteType> >::iterator it;
+                       for (it = _pending_note_selection.begin(); it != _pending_note_selection.end(); ++it) {
+                               if (*(*it) == *note) {
+                                       add_to_selection (cne);
+                               }
                        }
 
                } else {
@@ -1170,7 +1224,6 @@ MidiRegionView::redisplay_model()
                }
        }
 
-
        /* remove note items that are no longer valid */
 
        if (!empty_when_starting) {
@@ -1201,6 +1254,7 @@ MidiRegionView::redisplay_model()
 
        _marked_for_selection.clear ();
        _marked_for_velocity.clear ();
+       _pending_note_selection.clear ();
 
        /* we may have caused _events to contain things out of order (e.g. if a note
           moved earlier or later). we don't generally need them in time order, but
@@ -1247,8 +1301,8 @@ MidiRegionView::display_sysexes()
        if (!ARDOUR_UI::config()->get_never_display_periodic_midi()) {
 
                for (MidiModel::SysExes::const_iterator i = _model->sysexes().begin(); i != _model->sysexes().end(); ++i) {
-                       const boost::shared_ptr<const Evoral::MIDIEvent<Evoral::MusicalTime> > mev = 
-                               boost::static_pointer_cast<const Evoral::MIDIEvent<Evoral::MusicalTime> > (*i);
+                       const boost::shared_ptr<const Evoral::MIDIEvent<Evoral::Beats> > mev = 
+                               boost::static_pointer_cast<const Evoral::MIDIEvent<Evoral::Beats> > (*i);
                        
                        if (mev) {
                                if (mev->is_spp() || mev->is_mtc_quarter() || mev->is_mtc_full()) {
@@ -1280,10 +1334,10 @@ MidiRegionView::display_sysexes()
 
        for (MidiModel::SysExes::const_iterator i = _model->sysexes().begin(); i != _model->sysexes().end(); ++i) {
 
-               const boost::shared_ptr<const Evoral::MIDIEvent<Evoral::MusicalTime> > mev = 
-                       boost::static_pointer_cast<const Evoral::MIDIEvent<Evoral::MusicalTime> > (*i);
+               const boost::shared_ptr<const Evoral::MIDIEvent<Evoral::Beats> > mev = 
+                       boost::static_pointer_cast<const Evoral::MIDIEvent<Evoral::Beats> > (*i);
 
-               Evoral::MusicalTime time = (*i)->time();
+               Evoral::Beats time = (*i)->time();
 
                if (mev) {
                        if (mev->is_spp() || mev->is_mtc_quarter() || mev->is_mtc_full()) {
@@ -1358,6 +1412,7 @@ MidiRegionView::region_resized (const PropertyChange& what_changed)
 
        if (what_changed.contains (ARDOUR::Properties::position)) {
                _region_relative_time_converter.set_origin_b(_region->position());
+               _region_relative_time_converter_double.set_origin_b(_region->position());
                set_duration(_region->length(), 0);
                if (_enable_display) {
                        redisplay_model();
@@ -1448,6 +1503,21 @@ MidiRegionView::apply_note_range (uint8_t min, uint8_t max, bool force)
                        const double y0 = 1. + floor (midi_stream_view()->note_to_y(note->note()));
                        const double y1 = y0 + std::max(1., floor(midi_stream_view()->note_height()) - 1.);
 
+                       if (y0 < 0 || y1 >= _height) {
+                               /* During DnD, the region uses the 'old/current'
+                                * midi_stream_view()'s range and its position/height calculation.
+                                *
+                                * Ideally DnD would decouple the midi_stream_view() for the
+                                * region(s) being dragged and set it to the target's range
+                                * (or in case of the drop-zone, FullRange).
+                                * but I don't see how this can be done without major rework.
+                                *
+                                * For now, just prevent visual bleeding of events in case
+                                * the target-track is smaller.
+                                */
+                               event->hide();
+                               continue;
+                       }
                        cnote->set_y0 (y0);
                        cnote->set_y1 (y1);
 
@@ -1517,24 +1587,24 @@ MidiRegionView::end_write()
 /** Resolve an active MIDI note (while recording).
  */
 void
-MidiRegionView::resolve_note(uint8_t note, Evoral::MusicalTime end_time)
+MidiRegionView::resolve_note(uint8_t note, Evoral::Beats end_time)
 {
        if (midi_view()->note_mode() != Sustained) {
                return;
        }
 
        if (_active_notes && _active_notes[note]) {
+               /* Set note length so update_note() works.  Note this is a local note
+                  for recording, not from a model, so we can safely mess with it. */
+               _active_notes[note]->note()->set_length(
+                       end_time - _active_notes[note]->note()->time());
 
-               /* XXX is end_time really region-centric? I think so, because
-                  this is a new region that we're recording, so source zero is
-                  the same as region zero
-               */
+               /* End time is relative to the region being recorded. */
                const framepos_t end_time_frames = region_beats_to_region_frames(end_time);
 
                _active_notes[note]->set_x1 (trackview.editor().sample_to_pixel(end_time_frames));
                _active_notes[note]->set_outline_all ();
                _active_notes[note] = 0;
-
        }
 }
 
@@ -1548,15 +1618,14 @@ MidiRegionView::extend_active_notes()
                return;
        }
 
-       for (unsigned i=0; i < 128; ++i) {
+       for (unsigned i = 0; i < 128; ++i) {
                if (_active_notes[i]) {
                        _active_notes[i]->set_x1(
-                               trackview.editor().sample_to_pixel(_region->position() + _region->length()));
+                               trackview.editor().sample_to_pixel(_region->length()));
                }
        }
 }
 
-
 void
 MidiRegionView::play_midi_note(boost::shared_ptr<NoteType> note)
 {
@@ -1597,21 +1666,25 @@ MidiRegionView::start_playing_midi_chord (vector<boost::shared_ptr<NoteType> > n
                return;
        }
 
-       _note_player = boost::shared_ptr<NotePlayer>(new NotePlayer(route_ui->midi_track()));
+       NotePlayer* player = new NotePlayer (route_ui->midi_track());
 
        for (vector<boost::shared_ptr<NoteType> >::iterator n = notes.begin(); n != notes.end(); ++n) {
-               _note_player->add (*n);
+               player->add (*n);
        }
 
-       _note_player->on ();
+       player->play ();
 }
 
 
 bool
 MidiRegionView::note_in_region_range (const boost::shared_ptr<NoteType> note, bool& visible) const
 {
+       /* This is imprecise due to all the conversion conversion involved, so only
+          hide notes if they seem to start more than one tick before the start. */
+       const framecnt_t tick_frames       = Evoral::Beats::tick().to_ticks(trackview.session()->frame_rate());
        const framepos_t note_start_frames = source_beats_to_region_frames (note->time());
-       bool outside = (note_start_frames  < 0) || (note_start_frames > _region->last_frame());
+       const bool       outside           = ((note_start_frames <= -tick_frames) ||
+                                             (note_start_frames >= _region->length()));
 
        visible = (note->note() >= midi_stream_view()->lowest_note()) &&
                (note->note() <= midi_stream_view()->highest_note());
@@ -1658,11 +1731,10 @@ MidiRegionView::update_sustained (Note* ev, bool update_ghost_regions)
 
        if (!note->length()) {
                if (_active_notes && note->note() < 128) {
-                       // If this note is already active there's a stuck note,
-                       // finish the old note rectangle
-                       if (_active_notes[note->note()]) {
-                               Note* const old_rect = _active_notes[note->note()];
-                               boost::shared_ptr<NoteType> old_note = old_rect->note();
+                       Note* const old_rect = _active_notes[note->note()];
+                       if (old_rect) {
+                               /* There is an active note on this key, so we have a stuck
+                                  note.  Finish the old rectangle here. */
                                old_rect->set_x1 (x);
                                old_rect->set_outline_all ();
                        }
@@ -1702,6 +1774,13 @@ MidiRegionView::update_hit (Hit* ev, bool update_ghost_regions)
        const double diamond_size = std::max(1., floor(midi_stream_view()->note_height()) - 2.);
        const double y = 1.5 + floor(midi_stream_view()->note_to_y(note->note())) + diamond_size * .5;
 
+       // see DnD note in MidiRegionView::apply_note_range() above
+       if (y <= 0 || y >= _height) {
+               ev->hide();
+       } else {
+               ev->show();
+       }
+
        ev->set_position (ArdourCanvas::Duple (x, y));
        ev->set_height (diamond_size);
 
@@ -1725,7 +1804,7 @@ MidiRegionView::update_hit (Hit* ev, bool update_ghost_regions)
  * notes, and resolve_note should be called when the corresponding note off
  * event arrives, to properly display the note.
  */
-void
+NoteBase*
 MidiRegionView::add_note(const boost::shared_ptr<NoteType> note, bool visible)
 {
        NoteBase* event = 0;
@@ -1734,7 +1813,7 @@ MidiRegionView::add_note(const boost::shared_ptr<NoteType> note, bool visible)
 
                Note* ev_rect = new Note (*this, _note_group, note);
 
-               update_note (ev_rect);
+               update_sustained (ev_rect);
 
                event = ev_rect;
 
@@ -1783,11 +1862,12 @@ MidiRegionView::add_note(const boost::shared_ptr<NoteType> note, bool visible)
        MidiStreamView* const view = mtv->midi_view();
 
        view->update_note_range (note->note());
+       return event;
 }
 
 void
 MidiRegionView::step_add_note (uint8_t channel, uint8_t number, uint8_t velocity,
-                               Evoral::MusicalTime pos, Evoral::MusicalTime len)
+                               Evoral::Beats pos, Evoral::Beats len)
 {
        boost::shared_ptr<NoteType> new_note (new NoteType (channel, pos, len, number, velocity));
 
@@ -1806,17 +1886,19 @@ MidiRegionView::step_add_note (uint8_t channel, uint8_t number, uint8_t velocity
        view->update_note_range(new_note->note());
 
        _marked_for_selection.clear ();
-       clear_selection ();
 
        start_note_diff_command (_("step add"));
+
+       clear_selection ();
        note_diff_add_note (new_note, true, false);
+
        apply_diff();
 
        // last_step_edit_note = new_note;
 }
 
 void
-MidiRegionView::step_sustain (Evoral::MusicalTime beats)
+MidiRegionView::step_sustain (Evoral::Beats beats)
 {
        change_note_lengths (false, false, beats, false, true);
 }
@@ -1869,13 +1951,13 @@ MidiRegionView::patch_change_to_patch_key (MidiModel::PatchChangePtr p)
 
 /// Return true iff @p pc applies to the given time on the given channel.
 static bool
-patch_applies (const ARDOUR::MidiModel::constPatchChangePtr pc, Evoral::MusicalTime time, uint8_t channel)
+patch_applies (const ARDOUR::MidiModel::constPatchChangePtr pc, Evoral::Beats time, uint8_t channel)
 {
        return pc->time() <= time && pc->channel() == channel;
 }
        
 void 
-MidiRegionView::get_patch_key_at (Evoral::MusicalTime time, uint8_t channel, MIDI::Name::PatchPrimaryKey& key) const
+MidiRegionView::get_patch_key_at (Evoral::Beats time, uint8_t channel, MIDI::Name::PatchPrimaryKey& key) const
 {
        // The earliest event not before time
        MidiModel::PatchChanges::iterator i = _model->patch_change_lower_bound (time);
@@ -1899,7 +1981,9 @@ MidiRegionView::get_patch_key_at (Evoral::MusicalTime time, uint8_t channel, MID
 void
 MidiRegionView::change_patch_change (PatchChange& pc, const MIDI::Name::PatchPrimaryKey& new_patch)
 {
-       MidiModel::PatchChangeDiffCommand* c = _model->new_patch_change_diff_command (_("alter patch change"));
+       string name = _("alter patch change");
+       trackview.editor().begin_reversible_command (name);
+       MidiModel::PatchChangeDiffCommand* c = _model->new_patch_change_diff_command (name);
 
        if (pc.patch()->program() != new_patch.program()) {
                c->change_program (pc.patch (), new_patch.program());
@@ -1911,15 +1995,18 @@ MidiRegionView::change_patch_change (PatchChange& pc, const MIDI::Name::PatchPri
        }
 
        _model->apply_command (*trackview.session(), c);
+       trackview.editor().commit_reversible_command ();
 
        _patch_changes.clear ();
        display_patch_changes ();
 }
 
 void
-MidiRegionView::change_patch_change (MidiModel::PatchChangePtr old_change, const Evoral::PatchChange<Evoral::MusicalTime> & new_change)
+MidiRegionView::change_patch_change (MidiModel::PatchChangePtr old_change, const Evoral::PatchChange<Evoral::Beats> & new_change)
 {
-       MidiModel::PatchChangeDiffCommand* c = _model->new_patch_change_diff_command (_("alter patch change"));
+       string name = _("alter patch change");
+       trackview.editor().begin_reversible_command (name);
+       MidiModel::PatchChangeDiffCommand* c = _model->new_patch_change_diff_command (name);
 
        if (old_change->time() != new_change.time()) {
                c->change_time (old_change, new_change.time());
@@ -1938,6 +2025,7 @@ MidiRegionView::change_patch_change (MidiModel::PatchChangePtr old_change, const
        }
 
        _model->apply_command (*trackview.session(), c);
+       trackview.editor().commit_reversible_command ();
 
        _patch_changes.clear ();
        display_patch_changes ();
@@ -1949,13 +2037,15 @@ MidiRegionView::change_patch_change (MidiModel::PatchChangePtr old_change, const
  *  MidiTimeAxisView::get_channel_for_add())
  */
 void
-MidiRegionView::add_patch_change (framecnt_t t, Evoral::PatchChange<Evoral::MusicalTime> const & patch)
+MidiRegionView::add_patch_change (framecnt_t t, Evoral::PatchChange<Evoral::Beats> const & patch)
 {
        MidiTimeAxisView* const mtv = dynamic_cast<MidiTimeAxisView*>(&trackview);
+       string name = _("add patch change");
 
-       MidiModel::PatchChangeDiffCommand* c = _model->new_patch_change_diff_command (_("add patch change"));
+       trackview.editor().begin_reversible_command (name);
+       MidiModel::PatchChangeDiffCommand* c = _model->new_patch_change_diff_command (name);
        c->add (MidiModel::PatchChangePtr (
-                       new Evoral::PatchChange<Evoral::MusicalTime> (
+                       new Evoral::PatchChange<Evoral::Beats> (
                                absolute_frames_to_source_beats (_region->position() + t),
                                mtv->get_channel_for_add(), patch.program(), patch.bank()
                                )
@@ -1963,17 +2053,20 @@ MidiRegionView::add_patch_change (framecnt_t t, Evoral::PatchChange<Evoral::Musi
                );
 
        _model->apply_command (*trackview.session(), c);
+       trackview.editor().commit_reversible_command ();
 
        _patch_changes.clear ();
        display_patch_changes ();
 }
 
 void
-MidiRegionView::move_patch_change (PatchChange& pc, Evoral::MusicalTime t)
+MidiRegionView::move_patch_change (PatchChange& pc, Evoral::Beats t)
 {
+       trackview.editor().begin_reversible_command (_("move patch change"));
        MidiModel::PatchChangeDiffCommand* c = _model->new_patch_change_diff_command (_("move patch change"));
        c->change_time (pc.patch (), t);
        _model->apply_command (*trackview.session(), c);
+       trackview.editor().commit_reversible_command ();
 
        _patch_changes.clear ();
        display_patch_changes ();
@@ -1982,9 +2075,11 @@ MidiRegionView::move_patch_change (PatchChange& pc, Evoral::MusicalTime t)
 void
 MidiRegionView::delete_patch_change (PatchChange* pc)
 {
+       trackview.editor().begin_reversible_command (_("delete patch change"));
        MidiModel::PatchChangeDiffCommand* c = _model->new_patch_change_diff_command (_("delete patch change"));
        c->remove (pc->patch ());
        _model->apply_command (*trackview.session(), c);
+       trackview.editor().commit_reversible_command ();
 
        _patch_changes.clear ();
        display_patch_changes ();
@@ -2133,6 +2228,24 @@ MidiRegionView::invert_selection ()
        }
 }
 
+/** Used for selection undo/redo.
+    The requested notes most likely won't exist in the view until the next model redisplay.
+*/
+void
+MidiRegionView::select_notes (list<boost::shared_ptr<NoteType> > notes)
+{
+       NoteBase* cne;
+       list<boost::shared_ptr<NoteType> >::iterator n;
+
+       for (n = notes.begin(); n != notes.end(); ++n) {
+               if ((cne = find_canvas_note(*(*n))) != 0) {
+                       add_to_selection (cne);
+               } else {
+                       _pending_note_selection.insert(*n);
+               }
+       }
+}
+
 void
 MidiRegionView::select_matching_notes (uint8_t notenum, uint16_t channel_mask, bool add, bool extend)
 {
@@ -2249,8 +2362,8 @@ MidiRegionView::note_selected (NoteBase* ev, bool add, bool extend)
        } else {
                /* find end of latest note selected, select all between that and the start of "ev" */
 
-               Evoral::MusicalTime earliest = Evoral::MaxMusicalTime;
-               Evoral::MusicalTime latest   = Evoral::MusicalTime();
+               Evoral::Beats earliest = Evoral::MaxBeats;
+               Evoral::Beats latest   = Evoral::Beats();
 
                for (Selection::iterator i = _selection.begin(); i != _selection.end(); ++i) {
                        if ((*i)->note()->end_time() > latest) {
@@ -2408,7 +2521,7 @@ MidiRegionView::move_selection(double dx, double dy, double cumulative_dy)
 {
        typedef vector<boost::shared_ptr<NoteType> > PossibleChord;
        PossibleChord to_play;
-       Evoral::MusicalTime earliest = Evoral::MaxMusicalTime;
+       Evoral::Beats earliest = Evoral::MaxBeats;
 
        for (Selection::iterator i = _selection.begin(); i != _selection.end(); ++i) {
                if ((*i)->note()->time() < earliest) {
@@ -2481,7 +2594,7 @@ MidiRegionView::note_dropped(NoteBase *, frameoffset_t dt, int8_t dnote)
        for (Selection::iterator i = _selection.begin(); i != _selection.end() ; ++i) {
                
                framepos_t new_frames = source_beats_to_absolute_frames ((*i)->note()->time()) + dt;
-               Evoral::MusicalTime new_time = absolute_frames_to_source_beats (new_frames);
+               Evoral::Beats new_time = absolute_frames_to_source_beats (new_frames);
 
                if (new_time < 0) {
                        continue;
@@ -2511,22 +2624,25 @@ MidiRegionView::note_dropped(NoteBase *, frameoffset_t dt, int8_t dnote)
 }
 
 /** @param x Pixel relative to the region position.
+ *  @param ensure_snap defaults to false. true = snap always, ignoring snap mode and magnetic snap.
+ *  Used for inverting the snap logic with key modifiers and snap delta calculation.
  *  @return Snapped frame relative to the region position.
  */
 framepos_t
-MidiRegionView::snap_pixel_to_sample(double x)
+MidiRegionView::snap_pixel_to_sample(double x, bool ensure_snap)
 {
        PublicEditor& editor (trackview.editor());
-       return snap_frame_to_frame (editor.pixel_to_sample (x));
+       return snap_frame_to_frame (editor.pixel_to_sample (x), ensure_snap);
 }
 
 /** @param x Pixel relative to the region position.
+ *  @param ensure_snap defaults to false. true = ignore magnetic snap and snap mode (used for snap delta calculation).
  *  @return Snapped pixel relative to the region position.
  */
 double
-MidiRegionView::snap_to_pixel(double x)
+MidiRegionView::snap_to_pixel(double x, bool ensure_snap)
 {
-       return (double) trackview.editor().sample_to_pixel(snap_pixel_to_sample(x));
+       return (double) trackview.editor().sample_to_pixel(snap_pixel_to_sample(x, ensure_snap));
 }
 
 double
@@ -2544,7 +2660,7 @@ MidiRegionView::get_end_position_pixels()
 }
 
 framepos_t
-MidiRegionView::source_beats_to_absolute_frames(Evoral::MusicalTime beats) const
+MidiRegionView::source_beats_to_absolute_frames(Evoral::Beats beats) const
 {
        /* the time converter will return the frame corresponding to `beats'
           relative to the start of the source. The start of the source
@@ -2554,7 +2670,7 @@ MidiRegionView::source_beats_to_absolute_frames(Evoral::MusicalTime beats) const
        return  source_start +  _source_relative_time_converter.to (beats);
 }
 
-Evoral::MusicalTime
+Evoral::Beats
 MidiRegionView::absolute_frames_to_source_beats(framepos_t frames) const
 {
        /* the `frames' argument needs to be converted into a frame count
@@ -2566,17 +2682,23 @@ MidiRegionView::absolute_frames_to_source_beats(framepos_t frames) const
 }
 
 framepos_t
-MidiRegionView::region_beats_to_region_frames(Evoral::MusicalTime beats) const
+MidiRegionView::region_beats_to_region_frames(Evoral::Beats beats) const
 {
        return _region_relative_time_converter.to(beats);
 }
 
-Evoral::MusicalTime
+Evoral::Beats
 MidiRegionView::region_frames_to_region_beats(framepos_t frames) const
 {
        return _region_relative_time_converter.from(frames);
 }
 
+double
+MidiRegionView::region_frames_to_region_beats_double (framepos_t frames) const
+{
+       return _region_relative_time_converter_double.from(frames);
+}
+
 void
 MidiRegionView::begin_resizing (bool /*at_front*/)
 {
@@ -2625,9 +2747,11 @@ MidiRegionView::begin_resizing (bool /*at_front*/)
  * a difference when multiple notes are being resized; in relative mode, each note's length is changed by the
  * amount of the drag.  In non-relative mode, all selected notes are set to have the same start or end point
  * as the \a primary note.
+ * @param snap_delta snap offset of the primary note in pixels. used in SnapRelative SnapDelta mode.
+ * @param with_snap true if snap is to be used to determine the position, false if no snap is to be used.
  */
 void
-MidiRegionView::update_resizing (NoteBase* primary, bool at_front, double delta_x, bool relative)
+MidiRegionView::update_resizing (NoteBase* primary, bool at_front, double delta_x, bool relative, double snap_delta, bool with_snap)
 {
        bool cursor_set = false;
 
@@ -2638,15 +2762,15 @@ MidiRegionView::update_resizing (NoteBase* primary, bool at_front, double delta_
 
                if (at_front) {
                        if (relative) {
-                               current_x = canvas_note->x0() + delta_x;
+                               current_x = canvas_note->x0() + delta_x + snap_delta;
                        } else {
-                               current_x = primary->x0() + delta_x;
+                               current_x = primary->x0() + delta_x + snap_delta;
                        }
                } else {
                        if (relative) {
-                               current_x = canvas_note->x1() + delta_x;
+                               current_x = canvas_note->x1() + delta_x + snap_delta;
                        } else {
-                               current_x = primary->x1() + delta_x;
+                               current_x = primary->x1() + delta_x + snap_delta;
                        }
                }
 
@@ -2660,29 +2784,52 @@ MidiRegionView::update_resizing (NoteBase* primary, bool at_front, double delta_
                }
 
                if (at_front) {
-                       resize_rect->set_x0 (snap_to_pixel(current_x));
+                       if (with_snap) {
+                               resize_rect->set_x0 (snap_to_pixel(current_x) - snap_delta);
+                       } else {
+                               resize_rect->set_x0 (current_x - snap_delta);
+                       }
                        resize_rect->set_x1 (canvas_note->x1());
                } else {
-                       resize_rect->set_x1 (snap_to_pixel(current_x));
+                       if (with_snap) {
+                               resize_rect->set_x1 (snap_to_pixel(current_x) - snap_delta);
+                       } else {
+                               resize_rect->set_x1 (current_x - snap_delta);
+                       }
                        resize_rect->set_x0 (canvas_note->x0());
                }
 
                if (!cursor_set) {
-                       const double        snapped_x = snap_pixel_to_sample (current_x);
-                       Evoral::MusicalTime beats     = region_frames_to_region_beats (snapped_x);
-                       Evoral::MusicalTime len       = Evoral::MusicalTime();
+                       /* Convert snap delta from pixels to beats. */
+                       framepos_t snap_delta_samps = trackview.editor().pixel_to_sample (snap_delta);
+                       double snap_delta_beats = 0.0;
+                       int sign = 1;
+
+                       /* negative beat offsets aren't allowed */
+                       if (snap_delta_samps > 0) {
+                               snap_delta_beats = region_frames_to_region_beats_double (snap_delta_samps);
+                       } else if (snap_delta_samps < 0) {
+                               snap_delta_beats = region_frames_to_region_beats_double ( - snap_delta_samps);
+                               sign = -1;
+                       }
+
+                       const double  snapped_x = (with_snap ? snap_pixel_to_sample (current_x) : trackview.editor ().pixel_to_sample (current_x));
+                       Evoral::Beats beats     = region_frames_to_region_beats (snapped_x);
+                       Evoral::Beats len       = Evoral::Beats();
 
                        if (at_front) {
                                if (beats < canvas_note->note()->end_time()) {
-                                       len = canvas_note->note()->time() - beats;
+                                       len = canvas_note->note()->time() - beats + (sign * snap_delta_beats);
                                        len += canvas_note->note()->length();
                                }
                        } else {
                                if (beats >= canvas_note->note()->time()) {
-                                       len = beats - canvas_note->note()->time();
+                                       len = beats - canvas_note->note()->time() - (sign * snap_delta_beats);
                                }
                        }
 
+                       len = std::max(Evoral::Beats(1 / 512.0), len);
+
                        char buf[16];
                        snprintf (buf, sizeof (buf), "%.3g beats", len.to_double());
                        show_verbose_cursor (buf, 0, 0);
@@ -2698,9 +2845,9 @@ MidiRegionView::update_resizing (NoteBase* primary, bool at_front, double delta_
  *  Parameters the same as for \a update_resizing().
  */
 void
-MidiRegionView::commit_resizing (NoteBase* primary, bool at_front, double delta_x, bool relative)
+MidiRegionView::commit_resizing (NoteBase* primary, bool at_front, double delta_x, bool relative, double snap_delta, bool with_snap)
 {
-       start_note_diff_command (_("resize notes"));
+       _note_diff_command = _model->new_note_diff_command (_("resize notes"));
 
        for (std::vector<NoteResizeData *>::iterator i = _resize_data.begin(); i != _resize_data.end(); ++i) {
                Note*  canvas_note = (*i)->note;
@@ -2714,15 +2861,15 @@ MidiRegionView::commit_resizing (NoteBase* primary, bool at_front, double delta_
 
                if (at_front) {
                        if (relative) {
-                               current_x = canvas_note->x0() + delta_x;
+                               current_x = canvas_note->x0() + delta_x + snap_delta;
                        } else {
-                               current_x = primary->x0() + delta_x;
+                               current_x = primary->x0() + delta_x + snap_delta;
                        }
                } else {
                        if (relative) {
-                               current_x = canvas_note->x1() + delta_x;
+                               current_x = canvas_note->x1() + delta_x + snap_delta;
                        } else {
-                               current_x = primary->x1() + delta_x;
+                               current_x = primary->x1() + delta_x + snap_delta;
                        }
                }
 
@@ -2733,16 +2880,32 @@ MidiRegionView::commit_resizing (NoteBase* primary, bool at_front, double delta_
                        current_x = trackview.editor().sample_to_pixel(_region->length());
                }
 
-               /* Convert that to a frame within the source */
-               current_x = snap_pixel_to_sample (current_x) + _region->start ();
+               /* Convert snap delta from pixels to beats with sign. */
+               framepos_t snap_delta_samps = trackview.editor().pixel_to_sample (snap_delta);
+               double snap_delta_beats = 0.0;
+               int sign = 1;
+
+               if (snap_delta_samps > 0) {
+                       snap_delta_beats = region_frames_to_region_beats_double (snap_delta_samps);
+               } else if (snap_delta_samps < 0) {
+                       snap_delta_beats = region_frames_to_region_beats_double ( - snap_delta_samps);
+                       sign = -1;
+               }
+
+               /* Convert the new x position to a frame within the source */
+               framepos_t current_fr;
+               if (with_snap) {
+                       current_fr = snap_pixel_to_sample (current_x) + _region->start ();
+               } else {
+                       current_fr = trackview.editor().pixel_to_sample (current_x) + _region->start ();
+               }
 
                /* and then to beats */
-               const Evoral::MusicalTime x_beats = region_frames_to_region_beats (current_x);
+               const Evoral::Beats x_beats = region_frames_to_region_beats (current_fr);
 
                if (at_front && x_beats < canvas_note->note()->end_time()) {
-                       note_diff_add_change (canvas_note, MidiModel::NoteDiffCommand::StartTime, x_beats);
-
-                       Evoral::MusicalTime len = canvas_note->note()->time() - x_beats;
+                       note_diff_add_change (canvas_note, MidiModel::NoteDiffCommand::StartTime, x_beats - (sign * snap_delta_beats));
+                       Evoral::Beats len = canvas_note->note()->time() - x_beats + (sign * snap_delta_beats);
                        len += canvas_note->note()->length();
 
                        if (!!len) {
@@ -2751,12 +2914,9 @@ MidiRegionView::commit_resizing (NoteBase* primary, bool at_front, double delta_
                }
 
                if (!at_front) {
-                       const Evoral::MusicalTime len = x_beats - canvas_note->note()->time();
-
-                       if (!!len) {
-                               /* XXX convert to beats */
-                               note_diff_add_change (canvas_note, MidiModel::NoteDiffCommand::Length, len);
-                       }
+                       Evoral::Beats len = std::max(Evoral::Beats(1 / 512.0),
+                                                    x_beats - canvas_note->note()->time() - (sign * snap_delta_beats));
+                       note_diff_add_change (canvas_note, MidiModel::NoteDiffCommand::Length, len);
                }
 
                delete resize_rect;
@@ -2764,7 +2924,7 @@ MidiRegionView::commit_resizing (NoteBase* primary, bool at_front, double delta_
        }
 
        _resize_data.clear();
-       apply_diff();
+       apply_diff(true);
 }
 
 void
@@ -2811,12 +2971,12 @@ MidiRegionView::change_note_note (NoteBase* event, int8_t note, bool relative)
 }
 
 void
-MidiRegionView::trim_note (NoteBase* event, Evoral::MusicalTime front_delta, Evoral::MusicalTime end_delta)
+MidiRegionView::trim_note (NoteBase* event, Evoral::Beats front_delta, Evoral::Beats end_delta)
 {
        bool change_start = false;
        bool change_length = false;
-       Evoral::MusicalTime new_start;
-       Evoral::MusicalTime new_length;
+       Evoral::Beats new_start;
+       Evoral::Beats new_length;
 
        /* NOTE: the semantics of the two delta arguments are slightly subtle:
 
@@ -2831,7 +2991,7 @@ MidiRegionView::trim_note (NoteBase* event, Evoral::MusicalTime front_delta, Evo
                if (front_delta < 0) {
 
                        if (event->note()->time() < -front_delta) {
-                               new_start = Evoral::MusicalTime();
+                               new_start = Evoral::Beats();
                        } else {
                                new_start = event->note()->time() + front_delta; // moves earlier
                        }
@@ -2846,7 +3006,7 @@ MidiRegionView::trim_note (NoteBase* event, Evoral::MusicalTime front_delta, Evo
 
                } else {
 
-                       Evoral::MusicalTime new_pos = event->note()->time() + front_delta;
+                       Evoral::Beats new_pos = event->note()->time() + front_delta;
 
                        if (new_pos < event->note()->end_time()) {
                                new_start = event->note()->time() + front_delta;
@@ -2905,14 +3065,14 @@ MidiRegionView::change_note_channel (NoteBase* event, int8_t chn, bool relative)
 }
 
 void
-MidiRegionView::change_note_time (NoteBase* event, Evoral::MusicalTime delta, bool relative)
+MidiRegionView::change_note_time (NoteBase* event, Evoral::Beats delta, bool relative)
 {
-       Evoral::MusicalTime new_time;
+       Evoral::Beats new_time;
 
        if (relative) {
                if (delta < 0.0) {
                        if (event->note()->time() < -delta) {
-                               new_time = Evoral::MusicalTime();
+                               new_time = Evoral::Beats();
                        } else {
                                new_time = event->note()->time() + delta;
                        }
@@ -2927,7 +3087,7 @@ MidiRegionView::change_note_time (NoteBase* event, Evoral::MusicalTime delta, bo
 }
 
 void
-MidiRegionView::change_note_length (NoteBase* event, Evoral::MusicalTime t)
+MidiRegionView::change_note_length (NoteBase* event, Evoral::Beats t)
 {
        note_diff_add_change (event, MidiModel::NoteDiffCommand::Length, t);
 }
@@ -3039,11 +3199,11 @@ MidiRegionView::transpose (bool up, bool fine, bool allow_smush)
 }
 
 void
-MidiRegionView::change_note_lengths (bool fine, bool shorter, Evoral::MusicalTime delta, bool start, bool end)
+MidiRegionView::change_note_lengths (bool fine, bool shorter, Evoral::Beats delta, bool start, bool end)
 {
        if (!delta) {
                if (fine) {
-                       delta = Evoral::MusicalTime(1.0/128.0);
+                       delta = Evoral::Beats(1.0/128.0);
                } else {
                        /* grab the current grid distance */
                        delta = get_grid_beats(_region->position());
@@ -3063,8 +3223,8 @@ MidiRegionView::change_note_lengths (bool fine, bool shorter, Evoral::MusicalTim
                /* note the negation of the delta for start */
 
                trim_note (*i,
-                          (start ? -delta : Evoral::MusicalTime()),
-                          (end   ? delta  : Evoral::MusicalTime()));
+                          (start ? -delta : Evoral::Beats()),
+                          (end   ? delta  : Evoral::Beats()));
                i = next;
        }
 
@@ -3084,13 +3244,13 @@ MidiRegionView::nudge_notes (bool forward, bool fine)
           into a vector and sort before using the first one.
        */
 
-       const framepos_t    ref_point = source_beats_to_absolute_frames ((*(_selection.begin()))->note()->time());
-       Evoral::MusicalTime delta;
+       const framepos_t ref_point = source_beats_to_absolute_frames ((*(_selection.begin()))->note()->time());
+       Evoral::Beats    delta;
 
        if (!fine) {
 
                /* non-fine, move by 1 bar regardless of snap */
-               delta = Evoral::MusicalTime(trackview.session()->tempo_map().meter_at(ref_point).divisions_per_bar());
+               delta = Evoral::Beats(trackview.session()->tempo_map().meter_at(ref_point).divisions_per_bar());
 
        } else if (trackview.editor().snap_mode() == Editing::SnapOff) {
 
@@ -3248,7 +3408,8 @@ MidiRegionView::get_fill_color() const
                                      "midi frame base");
        if (_selected) {
                return ARDOUR_UI::config()->color_mod ("selected region base", mod_name);
-       } else if (high_enough_for_name || !ARDOUR_UI::config()->get_color_regions_using_track_color()) {
+       } else if ((!ARDOUR_UI::config()->get_show_name_highlight() || high_enough_for_name) &&
+                  !ARDOUR_UI::config()->get_color_regions_using_track_color()) {
                return ARDOUR_UI::config()->color_mod ("midi frame base", mod_name);
        }
        return ARDOUR_UI::config()->color_mod (fill_color, mod_name);
@@ -3341,10 +3502,12 @@ MidiRegionView::selection_as_cut_buffer () const
 bool
 MidiRegionView::paste (framepos_t pos, const ::Selection& selection, PasteContext& ctx)
 {
+       bool commit = false;
        // Paste notes, if available
        MidiNoteSelection::const_iterator m = selection.midi_notes.get_nth(ctx.counts.n_notes());
        if (m != selection.midi_notes.end()) {
                ctx.counts.increase_n_notes();
+               if (!(*m)->empty()) { commit = true; }
                paste_internal(pos, ctx.count, ctx.times, **m);
        }
 
@@ -3352,9 +3515,14 @@ MidiRegionView::paste (framepos_t pos, const ::Selection& selection, PasteContex
        typedef RouteTimeAxisView::AutomationTracks ATracks;
        const ATracks& atracks = midi_view()->automation_tracks();
        for (ATracks::const_iterator a = atracks.begin(); a != atracks.end(); ++a) {
-               a->second->paste(pos, selection, ctx);
+               if (a->second->paste(pos, selection, ctx)) {
+                       commit = true;
+               }
        }
 
+       if (commit) {
+               trackview.editor().commit_reversible_command ();
+       }
        return true;
 }
 
@@ -3368,14 +3536,14 @@ MidiRegionView::paste_internal (framepos_t pos, unsigned paste_count, float time
 
        start_note_diff_command (_("paste"));
 
-       const Evoral::MusicalTime snap_beats    = get_grid_beats(pos);
-       const Evoral::MusicalTime first_time    = (*mcb.notes().begin())->time();
-       const Evoral::MusicalTime last_time     = (*mcb.notes().rbegin())->end_time();
-       const Evoral::MusicalTime duration      = last_time - first_time;
-       const Evoral::MusicalTime snap_duration = duration.snap_to(snap_beats);
-       const Evoral::MusicalTime paste_offset  = snap_duration * paste_count;
-       const Evoral::MusicalTime pos_beats     = absolute_frames_to_source_beats(pos) + paste_offset;
-       Evoral::MusicalTime       end_point     = Evoral::MusicalTime();
+       const Evoral::Beats snap_beats    = get_grid_beats(pos);
+       const Evoral::Beats first_time    = (*mcb.notes().begin())->time();
+       const Evoral::Beats last_time     = (*mcb.notes().rbegin())->end_time();
+       const Evoral::Beats duration      = last_time - first_time;
+       const Evoral::Beats snap_duration = duration.snap_to(snap_beats);
+       const Evoral::Beats paste_offset  = snap_duration * paste_count;
+       const Evoral::Beats pos_beats     = absolute_frames_to_source_beats(pos) + paste_offset;
+       Evoral::Beats       end_point     = Evoral::Beats();
 
        DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("Paste data spans from %1 to %2 (%3) ; paste pos beats = %4 (based on %5 - %6)\n",
                                                       first_time,
@@ -3549,9 +3717,9 @@ MidiRegionView::update_ghost_note (double x, double y)
        framepos_t const f = snap_frame_to_grid_underneath (unsnapped_frame, grid_frames);
 
        /* calculate time in beats relative to start of source */
-       const Evoral::MusicalTime length = get_grid_beats(unsnapped_frame);
-       const Evoral::MusicalTime time   = std::max(
-               Evoral::MusicalTime(),
+       const Evoral::Beats length = get_grid_beats(unsnapped_frame);
+       const Evoral::Beats time   = std::max(
+               Evoral::Beats(),
                absolute_frames_to_source_beats (f + _region->position ()));
 
        _ghost_note->note()->set_time (time);
@@ -3620,9 +3788,9 @@ MidiRegionView::maybe_select_by_position (GdkEventButton* ev, double /*x*/, doub
        uint16_t chn_mask = mtv->midi_track()->get_playback_channel_mask();
 
        if (Keyboard::modifier_state_equals (ev->state, Keyboard::TertiaryModifier)) {
-               get_events (e, Evoral::Sequence<Evoral::MusicalTime>::PitchGreaterThanOrEqual, (uint8_t) floor (note), chn_mask);
+               get_events (e, Evoral::Sequence<Evoral::Beats>::PitchGreaterThanOrEqual, (uint8_t) floor (note), chn_mask);
        } else if (Keyboard::modifier_state_equals (ev->state, Keyboard::PrimaryModifier)) {
-               get_events (e, Evoral::Sequence<Evoral::MusicalTime>::PitchLessThanOrEqual, (uint8_t) floor (note), chn_mask);
+               get_events (e, Evoral::Sequence<Evoral::Beats>::PitchLessThanOrEqual, (uint8_t) floor (note), chn_mask);
        } else {
                return;
        }
@@ -3667,7 +3835,7 @@ MidiRegionView::enable_display (bool yn)
 }
 
 void
-MidiRegionView::show_step_edit_cursor (Evoral::MusicalTime pos)
+MidiRegionView::show_step_edit_cursor (Evoral::Beats pos)
 {
        if (_step_edit_cursor == 0) {
                ArdourCanvas::Item* const group = get_canvas_group();
@@ -3684,7 +3852,7 @@ MidiRegionView::show_step_edit_cursor (Evoral::MusicalTime pos)
 }
 
 void
-MidiRegionView::move_step_edit_cursor (Evoral::MusicalTime pos)
+MidiRegionView::move_step_edit_cursor (Evoral::Beats pos)
 {
        _step_edit_cursor_position = pos;
 
@@ -3704,7 +3872,7 @@ MidiRegionView::hide_step_edit_cursor ()
 }
 
 void
-MidiRegionView::set_step_edit_cursor_width (Evoral::MusicalTime beats)
+MidiRegionView::set_step_edit_cursor_width (Evoral::Beats beats)
 {
        _step_edit_cursor_width = beats;
 
@@ -3748,11 +3916,12 @@ MidiRegionView::data_recorded (boost::weak_ptr<MidiSource> w)
                }
 
                /* convert from session frames to source beats */
-               Evoral::MusicalTime const time_beats = _source_relative_time_converter.from(ev.time());
+               Evoral::Beats const time_beats = _source_relative_time_converter.from(
+                       ev.time() - src->timeline_position() + _region->start());
 
                if (ev.type() == MIDI_CMD_NOTE_ON) {
                        boost::shared_ptr<NoteType> note (
-                               new NoteType (ev.channel(), time_beats, Evoral::MusicalTime(), ev.note(), ev.velocity()));
+                               new NoteType (ev.channel(), time_beats, Evoral::Beats(), ev.note(), ev.velocity()));
 
                        add_note (note, true);
 
@@ -3905,7 +4074,7 @@ MidiRegionView::snap_frame_to_grid_underneath (framepos_t p, framecnt_t& grid_fr
 {
        PublicEditor& editor = trackview.editor ();
        
-       const Evoral::MusicalTime grid_beats = get_grid_beats(p);
+       const Evoral::Beats grid_beats = get_grid_beats(p);
 
        grid_frames = region_beats_to_region_frames (grid_beats);
 
@@ -3933,12 +4102,6 @@ MidiRegionView::selection_cleared (MidiRegionView* rv)
        clear_selection (false);
 }
 
-void
-MidiRegionView::note_button_release ()
-{
-       _note_player.reset();
-}
-
 ChannelMode
 MidiRegionView::get_channel_mode () const
 {
@@ -3954,14 +4117,14 @@ MidiRegionView::get_selected_channels () const
 }
 
 
-Evoral::MusicalTime
+Evoral::Beats
 MidiRegionView::get_grid_beats(framepos_t pos) const
 {
-       PublicEditor&       editor  = trackview.editor();
-       bool                success = false;
-       Evoral::MusicalTime beats   = editor.get_grid_type_as_beats(success, pos);
+       PublicEditor& editor  = trackview.editor();
+       bool          success = false;
+       Evoral::Beats beats   = editor.get_grid_type_as_beats(success, pos);
        if (!success) {
-               beats = Evoral::MusicalTime(1);
+               beats = Evoral::Beats(1);
        }
        return beats;
 }