void Awake()
    {
        /* Check if any instances of the
         * pitch tracker have been initialized;
         * quit if this is the case */

        if(_instance == null){
            _instance = this;
        }
        else{
            Debug.LogError("Only one instance of CTGPitchTracker may be active in the scene!");
            enabled = false;
            return;
        }
    }
    void Start()
    {
        /* Grab the instance of
         * the pitch tracker. */
        tracker = CTGPitchTracker.Tracker;

        /* Add a listener here
         * to be notified when a
         * new note is detected. */
        tracker.NoteDetected += onNoteDetected;
    }