void change_note_velocity(ArdourCanvas::CanvasNoteEvent* ev, int8_t vel, bool relative=false);
void change_note_note(ArdourCanvas::CanvasNoteEvent* ev, int8_t note, bool relative=false);
void change_note_time(ArdourCanvas::CanvasNoteEvent* ev, ARDOUR::MidiModel::TimeType, bool relative=false);
void change_note_velocity(ArdourCanvas::CanvasNoteEvent* ev, int8_t vel, bool relative=false);
void change_note_note(ArdourCanvas::CanvasNoteEvent* ev, int8_t note, bool relative=false);
void change_note_time(ArdourCanvas::CanvasNoteEvent* ev, ARDOUR::MidiModel::TimeType, bool relative=false);