I'm going to attempt to modify my Korg EX-800. "Atom Smasher" from synthmod.net has a fairly easy looking filter mod known as "The Moog Slayer" for my rackmount Poly-800. It involves removing two trim pots from the board and case mounting them so you can manually control the analog filter. While I'm at it, I'm going to swap the NOISE control trim pot on the board for a case mount pot as well.
He also has a slightly more complicated mod where you jump one of the points on the DCO's IC chip and control the oscillator's cutoff with a knob. I'm not really sure what that means, but if the filter mod goes well, I might try the other one.
I went ahead and removed the trim pots and I've ordered the parts along with a step drill bit to put clean holes in the metal case.
VR5 is the resonance, VR2 is the filter cutoff.
VR3 is the noise level.
Trim pots after I de-soldered them from the board.
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