Hey folks! Last year I performed the legendary @mnats/@Bertr "humbuster" mod on my PF-50t. This was such a great mod, and I'm glad I did it. Now, I'm trying to figure out if there are other mods I can do. I've been really interested in mods that add high frequency content to the signal… so I'm wondering: is it possible to do a "presence"/"resonance" mod on this amp? That is: has anyone thought much about the negative feedback loop on this amp and tried to add/remove signals from it? I know this is a popular mod for other amps, but I haven't looked at the schematic for this one to even know if it's even possible.