OldSynths

I am searching for a friend on info, schematics or repair techs for a
late '70s Crumar Orchestrator 2 (OTR2) s/n J2 00013. The unit powers
up but the only sound output is the Bass preset 'thump' out of the
Main and Bass output jacks. Evidently, the unit was working, insides
are clean and wiring harness intact.

Any suggestions welcome.

-Jim