1meg gain pot on your 2204. Friedman puts a resistor across that so end up being 250k in the DS for instance. 1M pot will get mushy at higher settings. Reduce pot value, increase gain elsewhere.
Having trouble figuring this one out, maybe someone here has some insight. No luck on other forums and I've been working on amps a long time, never exactly seen anything like this. Signal generator won't trigger it so hard as hell to see on a scope.
On Gain channel: When tremolo or speed...