Turing it up too much may cause squealing or self-oscillation.
LOUDER trimmer:
This trimmer affects the gain of the second half of the op amp.
Originally it was a 1k resistor, so setting this trimpot to just shy of full turn counter
clockwise will give you stock TS808 specs. Turning it up will increase the amount of
drive and overall output. Turning it up too much may cause squealing or self-oscillation
on certain settings. Particularly if you turn the tone knob up all the way full turn
clockwise. This mod does not work very well if you built your pedal to MOSFET specs.
It will add a lot of noise, so if you built your kit to MOSFET specs, you should turn it
down just about as low as it can go and still give you full range on the tone knob (turning
it full turn counter clockwise will make the tone knob less useful).
