Discussion about the Korg PolySix synthesizer

ok, I checked the klm361 (digital pcb)
all traces and thru-holes in the battery section are ok...
I measured them with my multimeter.

I made a sound example so that you can listen how bad my poly6 sounds:

http://www.cmaudio.net/poly6prob.mp3

as I wrote earlier in my thread the problem is on the klm 361 pcb (I
interchanged it with the board from a working p6 and then it was fine...)

I think the dc voltage from the digital board are not clean.. 
I already changed all electrolytic caps, but what should I do next?

change some ics?

or borrow a scope and measure the pins at the connectors? looking for
some voltages that could cause this modulations??


thanks for your help
mat