Casio LK-270 - Manual (Page 22)

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Note 1:
For information about the relationship between setting values and send/receive values, see "33.6 Chorus Type Setting Value
Table" in "Part VII Setting Values and Send/Receive Values".
Send
This message is sent when the System Chorus Type setting is changed.
Receive
Receipt changes the System Chorus Type parameter.
Rate Format
Note 1:
The setting value matches the value that is sent and received.
Send
This message is never sent.
Receive
Receipt changes the System Chorus Rate parameter.
18.1.6 GM System Message
GM System On Format
Send
This message is never sent.
Receive
Receipt puts the sound source into a GM sound source mode.
GM System Off Format
Send
This message is never sent.
Receive
Receipt changes the sound source setting to the Instrument presetting.
GM2 System On Format
Send
This message is never sent.
Receive
Though the Instrument does not support GM2, receipt of the GM2 System On message has the same result as receipt of
the GM System On message.
Message Format: F0H 7FH 7FH 04H 05H 01H 01H 01H
01H 02H 01H vvH F7H
vv: Value (Note1)
Message Format: F0H 7EH 7FH 09H 01H F7H
Message Format: F0H 7EH 7FH 09H 02H F7H
Message Format: F0H 7EH 7FH 09H 03H F7H