The DR-660 can be synchronized to any MIDI device that transmits MIDI clock. Use the following steps to set the DR-660 to external sync:
1. With a MIDI cable, connect the MIDI OUT of the external MIDI device to the MIDI IN of the DR-660.
2. Press MIDI.
3. Press the CURSOR < or > buttons to select "3 SYNC."
4. Turn the VALUE DIAL to select "MIDI."
Note: The selected song or pattern in the DR-660 will play only when receiving a "MIDI Clock" message. The external MIDI device determines the tempo and the DR-660 will follow in "sync" when you start or stop the external unit.
5. Press SONG/PTN to return to play mode.