private void Awake()
{
_metronome = GameObject.Find("MusicManager").GetComponent <Metronome>();
_metronome.TempoChange(_gametempo, _subdivision);
_trackA = GameObject.Find("TrackA").GetComponent <AudioSource>();
_trackB = GameObject.Find("TrackB").GetComponent <AudioSource>();
_trackC = GameObject.Find("TrackC").GetComponent <AudioSource>();
_trackD = GameObject.Find("TrackD").GetComponent <AudioSource>();
// track A is assigned below as it shares clip
_trackB.clip = Phase1;
_trackC.clip = Phase2;
_trackD.clip = Transition;
}