Discussion about the Korg PolySix synthesizer

One frequent problem with the CPU board can cause unwanted modulation of 
the VCO, which can sound like what  you're describing.
To see if this is the case, get a soldering iron & lift one end of R9, 
which is a 10K resistor located between IC8 and CN05.
This will disconnect all modulation to the VCO;  if it eliminates the 
problem, let me know, and I'll describe where to go f rom there.

~GMM

mborish_2000 wrote:
>  
>
> I've got a few problems that I can't figure out. Unfortunately, my LFO 
> is bleeding into the VCA? and I can't figure out a way to stop it. 
> It's not a violent bleed but it's enought to make the Polysix 
> unusable. If I turn all of the controls down, it is still there. All 
> of the controls are functional. All of the potentiometers test out OK. 
> I tested all cables for continuity. I cleaned the LFO modulation 
> select switch and replaced the 4051 on KLM 369 without any luck. I 
> read somewhere that somebody suggested cutting a trace, but they 
> couldn't remember enough details about what they did. I didn't see any 
> calibration proceedure related to the LFO modulation either. 
> Everything else works fine.
>
> Does anybody have any suggestions? Logic and microprocessing are 
> really beyond my knowledge.
>
> -Mike
>


> 



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