I love the sound of Allen's Raw control on his amps... I see where people have done this to their PR/PRRIs.... having a hard time finding details of it, but did find this... mid/raw-pot (replaced the 6.8k resistor going to ground from the bass pot with a 25k pot) - I found that my amp sounds best (again, with clean tones!) when that pot is set right at about 6 to 8k, so that wasn't so useful... Is that it? The whole mod? Just replace the mids resistor with a 25K pot? I assume the 25K pot is also going to ground? Which resistor in a PRRI is the mids resistor?