Cool stuff! Fixed it for a friend of mine.
All potentiometers and switches had awfully bad contacts, major cleaning necessary. Again, the good old Caig fader lube and loads of q-tips did the job.
Needless to say that the keyboard contacts were awkward too.
Designed and installed a subcircuit for that odd gate input, now it triggers with standard trigger levels and makes interfacing much easier.
This unit still had an OTA based filter compared to the later SSM based devices.
Very nice and fun to play synth, apparently comparable to an ARP Odyssey, but I can’t tell since I never owned one.