The leakage from MG to VCO on battery damaged boards is well known. It is
usually between the board traces that go to pin 2 (VCO mod) and pin 1 (LFO
output) on CN06. Some people have cut the trace at both ends from pin 2 over to
R9 (10Kohm) and wired around this away from the board. Sometimes it is better to
remove the wire for pin2 from CN06, unsolder one end of R9, and connect a wire
from the blue wire over to R9, bypassing the board completely. This is easy to
try without doing anything pemanent, so you can see if it is going to work. You
just have to push the little tab to remove the female connecter and blue wire
from pin 2 location on CN06.
Don B.
Sent: Thursday, March 1, 2018 3:39 PM
Subject: [PolySix] Re: P6 MG Oddity
Hi SynthGuy,
It is 100% a fault, usually the MG modulation is exclusively VCO, VCF or
VCA.
The only way that a working P6 would
have multiple MG destinations is by using the Mod Wheel to introduce some VCO
Modulation.
I imagine the one I am having trouble
with is the victim of battery leakage and even though it has got a cloned KLM
board I expect that the original owner may have transplanted damaged components
to it from the original board.
Good luck, there are some really kind
and helpful guys on here willing to help out.
Jim