Discussion about the Korg PolySix synthesizer

Hi,
First of all congratulations to all Polysix user's. I hope you can help 
me to bring life to my Polysix !!

I'm from Portugal and I've bought a S/H Polysix in ebay. I bought the 
P6 knowing that is not working and hopping with my (some) electronic 
knowledge and the service manual I could fix it.
Symptom......NO SOUND !!!

First, with old crow's site help, I've replace the leaking battery for 
a CR 2032, fix all the damage tracks and installed 2 new IC30 and IC31.

Some tracks of the KLM-369 near the IC NJM4556 had a black dust mask 
presuming that it was hot in there....So they were fix, replace all 
resistors and capacitors and the NJM4556.

Power up....and for my dispair..........no sound....:(((( 

All program leds are ok and change when they are pressed.

I've notice another thing....if I turn the volume to the max I hear a 
far far away same sound, but not change when I turn the ADSR, CUTOFF, 
VCA, VCF, etc, pots. Only the arppegio changes that sound...

What could be that ?

ANYONE CAN HELP ME ? PLEASE ?