xx: The AUX port number.
yy: The type of MIDI data
that controls AUX.
0: Volume, output 0~5V
according to the total MIDI
volume.
1: Pitch Bend, according to
the pitch bend value, the
output voltage is 0~5V.
2: After Touch, according to
the amount of after touch,
output 0~5V
3: MIDI CC, according to
the MIDI controller, output
0~5V.
4: Trig Pulse, when a new
Note is generated, a fixed
pulse is triggered.
5: MIDI Clock, output MIDI
clock.