Yamaha O2R Owner's Manual page 373

If parameter change reception is ON and a parameter request is received on the specified MIDI channel, the
contents of the corresponding parameter will be transmitted on the specified MIDI channel regardless of
whether transmission is ON or OFF.
If parameter change reception is ON and a parameter change is received on the specified MIDI channel, the
contents of the corresponding parameter will be modified.
Transmission of KEY REMOTE parameter changes can be turned ON or OFF using the "Preferences" display
function (see "Preferences" on page 198 of the User's Guide) independently of other parameters. This is used
only in special circumstances such as when externally monitoring key operations. Normally, it should be left
OFF.
2-3. Active sensing, MIDI reset
If, after receiving Active Sensing, no messages are received for an interval longer than 300 ms, or when MIDI
Reset is received, only the running status will be cleared.
Active Sensing is transmitted.
2-4. Quarter-frame messages
MIDI Time Code Quarter-frame messages are received at the MTC connector.
3. Echo Back
If ECHO is turned ON, the Program Change messages will be transmitted immediately after being received.
4. Transmission Condition
PROGRAM CHANGE $CnH
SYSTEM EXCLUSIVE
PARAMETER CHANGE
$F0H, $43H, $1nH
(KEY REMOTE)
(RESPONSE FOR
PARAMETER REQUEST)
SYSTEM EXCLUSIVE
BULK DUMP
BULK REQUEST $F0H, $43H, $2nH
MIDI IN PROGRAM CHANGE $CnH
ACTIVE SENSE $FEH
PGM T
PARAM T
KEY REMOTE T
$F0H, $43H, $0nH
ON
ON
ON
MIDI CH?
PGM ECHO ON
Appendix: MIDI
MIDI OUT
02R User's Guide
263