Last commands:
71 (Next Octave)
247 (Base octave C)
248 (Base octave C#)
281 (Stop base octave C)
249 (Base octave D)
282 (Stop base octave C#)
250 (Base octave D#)
283 (Stop base octave D)
247 (Base octave C)
284 (Stop base octave D#)
