/*
  Serial Codes:
     Inside Play Mode:  [startbit, finger, sound, velocity]
     Inside Menu Mode:  [startbit, finger, sound, 0]
         UNLOCK:        [startbit, finger, UNLOCK, 0]
         LOCK:          [startbit, finger, LOCK, 0]
     
     Transfer Play Mode: [startbit, PLAY, 0, 0]
     Transfer Menu Mode: [startbit, MENU, 0, 0]
     
     Serial Codes:
     Inside Play Mode:  [200, 0-9, 0-50, 0-127]
     Inside Menu Mode:  [200, 0-9, 0-50, 0    ]
         UNLOCK:        [200, 0-9, 210, 0]
         LOCK:          [200, 0-9, 211, 0]
     
     Transfer Play Mode: [200, 220, 0, 0]
     Transfer Menu Mode: [200, 221, 0, 0]

*/