Discussion about the Korg PolySix synthesizer

Should also mention:
something else to try is cutting the trace between CN06-2 and R9;  this 
is the CV from the mod box to the VCO, and it runs very close to a 
digital buss that can inject unwanted noise.  If cutting this trace (at 
BOTH ends) solves the distortion problem, you can solder a wire jumper 
between CN06-2 and R9 to restore the mod control without the unwanted noise.

 >First place to look is the VCO Mod output from the CPU board to the 
voice board (CN05 -12).
 >This should be a smooth voltage;  distortion here will be reflected in 
the VCO sound.
 >Possible causes are faulty 4051 CV demux, faulty 4558 opamp buffer, 
faulty filtering cap, etc.
 >It should be easy to track down, following the control signal path 
with a scope.
 >~G
Kenneth Abildgaard wrote:
>  
>
> And thanks for having me J
>
> I recently acquired a Polysix in very nice cosmetic condition but it 
> has an
> issue with it's sound.
>
> I bought it knowing this but maybe someone here can help me finding 
> out what
> to look for as it is quite an annoying problem.
>
> Take a listen here:
>
> http://12bit.com/Audio/Polysix/Polysix.mp3
>
> It is a clean saw wave playing the first sound and it does not matter if I
> turn any MG/LFO knobs. It just sounds like there is always this very fast
> LFO running on the VCO.
>
> Anyone ever heard of this and know what to look for ?
>
> Best;
>
> Kenneth
>
> 12bit.com
>
> [Non-text portions of this message have been removed]
>
> 




[Non-text portions of this message have been removed]