Discussion about the Korg PolySix synthesizer

Hi!

I have a few problems with my Polysix.

1. In poly mode: when i'm pressing same note for example 4 times, one
sound gets detuned. So 3 sounds are ok 1 is detuned down.

2. In unision the sound is detuned.

3. when i'm writing the patch some time later it sounds diffrent -
sustain or decay changes. dunnow why. the battery is new!

i've read that i can change pc-i into VTL5C3. but it has 3 pins on
left and 2 pins on right so where should i put the connectors of VTL5C3?

are there any photos of that mod?

help
radek