Hi guys, I have an idea that I was wondering if any of you could make suggestions on. I've got some Q-Tuners that will be here sometime this week and I'll be installing them in my Peavey Grind NTB-4. I plan to upgrade the pots with the pickups by going to a Master volume, blend, Varitone, and master tone knobs. What I'd like to do is make the master tone pot a push/pull switch with a capacitor that would take the extra high end the Q-Tuner pickups are famous for and shunt it to ground. The idea would be to have a single switch, independent of the tone control that would allow a quick change from that modern "wide range" sound to a more vintage growl. I'm just not sure which capacitor value would be a good range to start in. Does anyone know of any formulas for calculation of cutoff frequencies for cap values in a tone circuit? I think that something around a 8-9kHz cutoff would probably do the trick without sacrificing too many overtones to sound vintage. Then the tone knob could handle anything else. Any help you guys might have would be greatly appreciated.