def stop_Note(self, note):
        """Add a note_off event for note to event_track."""
        velocity = 64
        channel = 1
        if hasattr(note, 'dynamics'):
            if 'velocity' in note.dynamics:
                velocity = note.dynamics['velocity']
            if 'channel' in note.dynamics:
                channel = note.dynamics['channel']
        if hasattr(note, 'channel'):
            channel = note.channel
        if hasattr(note, 'velocity'):
            velocity = note.velocity
        self.track_data += self.note_off(channel, int(note) + 12, velocity)
Add a note_off event for note to event_track.