The pot worked but I think I'll put a much smaller value one in and mount it on the back. After about 10k of resistance there isn't any change in feel. My other amp a PV Special has a discrete transistor output driver stage. Looking at the schematic I think raising R79 would increase the current feedback. R96 is the current sensing resistor? There dosen't seem to be any voltage feedback? Does that look right to you guys?