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Hi Alan
> From your description it sounds like you filter chip SSM2044 may havefirst he should check whether there is a signal at pin 1 (input) of the
> gone.
> mean it seems that the rubber contact has corroded or the PCB contactcheck also http://www.oldcrows.net/~oldcrow/synth/korg/polysix/keyclean.html
> You night find the rubber strips on ebay. same type as in the polysix
> and another few keyboards. as for finding a complete keyboard PCB that
> might be more tricky.