via this auction
"All features work fully and have been properly checked.
Programmer and patch memory are all fully working.
Very little wear and minor marking from normal use.HISTORY / SPEC / CONDITIONS
This is the all discrete version which means it uses discrete circuitry for the VCO's, VCF, VCA and for the Envelope Generators, similar to the SEM modules.
Later OB-1's replaced this circuit with CEM 3310 IC's, the same as the OB-X. Apparently only 200 were made and this is number 59.
Twin discrete VCO's with great features such as continuously variable wave shapes and sub oscillators, cross modulation, switchable 2 or 4 pole filter.
It is the first truly programmable synth with 8 non volatile patch memories, all the black topped knobs indicate that their values can be stored into memory and the grey topped knobs are the ones that can't."
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