You can set the F-20 to transmit on MIDI channel 1-16 - here is the procedure:
1. Hold down KEY TOUCH and PIANO.
2. While continuing to hold KEY TOUCH and PIANO, press one of the keys below:
C1 = MIDI Channel 1
C#1 = MIDI Channel 2
D1 = MIDI Channel 3
D#1 = MIDI Channel 4
E1 = MIDI Channel 5
F1 = MIDI Channel 6
F#1 = MIDI Channel 7
G1 = MIDI Channel 8
G#1 = MIDI Channel 9
A1 = MIDI Channel 10
A#1 = MIDI Channel 11
B1 = MIDI Channel 12
C2 = MIDI Channel 13
C#2 = MIDI Channel 14
D2 = MIDI Channel 15
D#2 = MIDI Channel 16