Hi guys, thought I'd post this question up for the learned bunch that may have some technical knowledge of the late 70's Fender SF amps that have the super fancy 'pull boost' master volume. I have a late 70's Pro Reverb that has this and while I can see why lots of folks dont like it, I can find some pretty unique tones out of it. To me it sounds a lot like its trying to create a mid frequency boost, for cutting solos through a mix etc.. Anyway, can anyone who has some technical understanding explain what the feature is doing in lay terms? Following - could this feature be modded to be more useful to more folks? ie, mod it to boost all frequencies? or be a treble boost? Also - what would removing it from the circuit do? Nothing..? Maybe the pull feature could be modded to remove the tone stack?