protected virtual void OnNoteOn(NoteEventArgs e)
        {
            EventHandler <NoteEventArgs> handler = NoteOn;

            if (handler != null)
            {
                handler(this, e);
            }
        }
 private void OnNoteOn(object sender, NoteEventArgs e)
 {
     playbackEngine.StartNote(e.NoteName);
 }
 void OnNoteOff(object sender, NoteEventArgs e)
 {
     playbackEngine.StopNote(e.NoteName);
 }