Roland CR-78 CompuRhythm with Rare Future Retro Sync Box (One of Two Made)

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via this auction

According to the listing only two of the FR Sync Boxes were made. I'll see if I can get confirmation on this from Future Retro.

via the listing:
"The programmer/sync box was custom made by Future Retro (only two made). Works similar to the original WS-1 that Roland released with this.

* Sync the CR-78 to any other Din Sync device
* Select the playback sync rate to: (1) normal speed, (2) double speed, (3) half speed
* Use external positive polarity Gate or Trigger signals to programm patterns into the CR-78 user memory.
* Manually tap a beat into the CR-78 user memory using the momentary switch on the front panel.
* Front panel blue LED lights to show when external gate or trigger signals are being received.
* Sync box is powered using a 9v battery (included)
* Instructions for using the sync box will be included with the item.

By syncing the playback of the CR-78 to your Din Sync master eg.TR-808/TR-606/Future Retro Revolution, you can then send the programmable trigger or gate signals out of the master into the programmer interface and on to the CR-78 for storing your own custom rhythms in the CR-78. When using a Din Sync master device which also has MIDI such as the Revolution, you can then sync your CR-78 to any other MIDI sequencers as well."

Update: I heard back from Future Retro. Not only are there only two in existence, this is the only one released to the public. The other is still with FR.