+
+/** Transpose notes in a time range by a given number of semitones. Notes
+ * will be clamped at 0 and 127 if the transposition would make them exceed
+ * that range.
+ *
+ * @param from Start time.
+ * @param end End time.
+ * @param semitones Number of semitones to transpose by (+ve is higher, -ve is lower).
+ */
+void
+MidiModel::transpose (TimeType from, TimeType to, int semitones)
+{
+ boost::shared_ptr<const MidiSource> s = midi_source ();
+
+ NoteDiffCommand* c = new_note_diff_command (_("transpose"));
+
+ for (Notes::iterator i = notes().begin(); i != notes().end(); ++i) {
+
+ if ((*i)->time() >= to) {
+
+ /* finished */
+ break;
+
+ } else if ((*i)->time() >= from) {
+
+ int new_note = (*i)->note() + semitones;
+
+ if (new_note < 0) {
+ new_note = 0;
+ } else if (new_note > 127) {
+ new_note = 127;
+ }
+
+ c->change (*i, NoteDiffCommand::NoteNumber, (uint8_t) new_note);
+
+ }
+ }
+
+ apply_command (s->session (), c);
+}
+
+void
+MidiModel::control_list_marked_dirty ()
+{
+ AutomatableSequence<Evoral::MusicalTime>::control_list_marked_dirty ();
+
+ ContentsChanged (); /* EMIT SIGNAL */
+}