Casio AP-220 - 10 Mode Messages; All Notes off (7 BH); Omni off (7 CH); Omni on (7 DH)

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10 Mode Messages
10.1 All Notes Off (7BH)
Format
Send
Sent in the following cases.
• When the keyboard channel is changed
• When a recorder function is used
Receive
Receipt of this message releases the currently sounding voice (same as releasing the keyboard key).
10.2 Omni Off (7CH)
Format
Send
This message is never sent.
Receive
Receipt of this message releases the currently sounding voice (same as releasing the keyboard key).
10.3 Omni On (7DH)
Format
Send
This message is never sent.
Receive
Receipt of this message releases the currently sounding voice (same as releasing the keyboard key).
Message Format: BnH 7BH 00H
n: MIDI Channel Number
Message Format: BnH 7CH 00H
n: MIDI Channel Number
Message Format: BnH 7DH 00H
n: MIDI Channel Number