Roland MV-8800 Owner's Manual page 308

Synchronizing the MV-8800 with a connected external sequencer
If the sequencer does not operate when MMC is received
Since MMC commands are exclusive messages, the MV-8800 will not follow them unless its Device ID matches.
Use the following procedure to set the Device ID.
1.
Press [SYSTEM].
The SYSTEM MENU screen (Screen Guide; p. 172) will appear.
2.
With the cursor located in the upper row of icons, press [F3](MIDI). Alternatively,
select the MIDI icon and press [ENTER].
The MIDI screen (Screen Guide; p. 177) will appear.
3.
Set the Device ID.
Set this value to match the Device ID setting of the MMC messages that are being sent to the
MV-8800.
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MV-8800 Owner's Manual
If the incoming messages have a device ID of "7F" (Broadcast), the messages will be received regardless of
the Device ID setting.