Vintage Synth Repair

I completely removed the submodule and jumpered over it. There is now sound. So the problem is within the submodule. 

--- In vintagesynthrepair@yahoogroups.com, "Alexis V. Rogers" <alexis.v.rogers@...> wrote:
>
> The VCA Gain slider only increases hiss. There is no drone. The AR and ADSR all affect the thumping/clicking sound which is just barely audible. With a scope, I can trace the audio signal into Board C-II, through the Audio Switches and Mixer Sliders. But the signal suddenly disappears at the junction of R1-R3 and C1 and C13, just before the input of the 4075.
>