* Chrome Only.
[P] Play/Stop
[W] Wave On/Off
[F] FFT On/Off
[N] Next Song
[M] MIDI On
need -> chrome://flags #enable-web-midi
[0x90, 0x01, 0x7F] Play/Stop
[0x90, 0x00, 0x7F] Wave On/Off
[0x90, 0x05, 0x7F] FFT On/Off
[0x90, 0x02, 0x7F] Next Song
[0xB0, 0x02, 0x00-0x7F] Scroll
[O] Operation On/Off
