list<boost::shared_ptr<MidiTrack> > mt (
_session->new_midi_track (ChanCount (DataType::MIDI, 1),
ChanCount (DataType::MIDI, 1),
list<boost::shared_ptr<MidiTrack> > mt (
_session->new_midi_track (ChanCount (DataType::MIDI, 1),
ChanCount (DataType::MIDI, 1),