full disclosure, this is regarding a pcbguitarmania PCB, however, in all possible places I have changed the values of components to match the pedalpcb schematic. with the small exception of C3, which is currently a film cap. the PCBGM schematic had a 470n film there. i've already changed the volume pot to linear taper, and still, i've got to turn it almost all the way up to get to max gain. the bias on Q1 is about 4.2. i have already corrected the issue where they had Q2 the wrong way around. it SOUNDS good, it's just too quiet.
any idea how to get more clean gain out of this circuit? volume at max shouldn't be unity gain.