Korg Poly800/EX800 Users

I performed the slayer mod about two years ago and was very pleased 
with the results, but now I want to see if I can get more knobs on 
the korg. I remember when I put the pots in the two parts of the 
board were labelled VR2 & VR5, and there were several other "VR" pots 
around the circuit board. I assume these correspond with other filter 
effects, and was wondering if anyone could tell me which ones would 
allow me to put knob control on the EG, rate, DCO, VCF and delay 
functions of the original poly800. I honestly can't make heads or 
tails out of the zipped schematic of the korg.
Also, if I were to put knobs on these functions, would I have to 
ground the upgrade and have a resistor again (finding the resistor 
was the hardest part of the slayer mod for me!)
any info would be great, thanks
~AJB