Have you swap SSM2044 with another voice to make sure the issue follows the filter? Never serviced a Polysix though, but I had a similar behavior on my Trident MkII. The SSM2044 was faulty.
HTH
François
--- In PolySix@yahoogroups.com, "blzproductions" <bob@...> wrote:
>
> Hi
>
> Servicing a Polysix for a client, and have come up against a weird issue, which I can't fathom. Hoping someone out there has had a similar issue, and may be able to help...
>
> One voice has a faulty filter section in that the resonance can be adjusted as per the line up procedure, but then if you lower the cut off, the resonance decreases.
>
> I have ruled out the problem being the SSM2044, all signals coming into the chip (ie. cut off/resonance control etc.) look correct, and are comparable, and I'm pretty sure it's not the filter caps as they're not electrolytics or Tantalums.
> Also the connections between the caps and the filter chip are all OK.
>
> If anyone has any ideas, please get it touch. It's beginning to drive me mad.
>
>
> Bob
>