Well I'm done tinkering with this amp.
I installed a speaker jack (not much to show there, so no pics) on the bottom of the chassis.
I noticed a huge difference between the volume of the drive and clean sounds.
eg; if I get the clean setup to where I like it, and then switch in the drive, there is a huge volume jump that doesn't work for me.
I prefer just a modest vol increase + the distortion.
The culprit seems to be the 2 resistors, R5 and R6 in the attached schematic.
BTW this schem part numbering does not match my board, but no matter... the circuit seems to be the same.
Anyways.... after some experimenting I left R6 alone and changed R5 to a 22K.
Now the clean sound dials in at much lower settings, but that's ok, cuz switching in the drive gives me the slight vol boost + dist that I want.
Down side is... if I crank the clean setting too much, it starts sounding just like the drive is switched in, and very little difference when the drive is actually switched in.
Oh well... its still better than the huge jump in volume from before.
