CRUMAR PERFORMER: Noise Reduction Mod and Sustain Mod

Today I am looking at a friend's Crumar Performer.
We noticed a considerable hiss noise when activating the String sections.
The hiss goes away when using only Brass.
I investigate where the noise is coming from, and what's to be done about it.
I discover a simple way to boost the strings signal without affecting the noise floor.

Another strange deal, by design, the brass button defeats the strings sustain.
I explore the sustain mod to restore the strings decay while using brass.