My gear list is in my profiel, but just incase... I'm running the following setup: Modulus Q5 (Barts) > Rack __________________________ Furman PL-PLUS Korg DTR2 Rack Tuner BBE Sonic Max 482 ADA MB-1 Pre-amp QSC PLX 2402 Power Amp ___________________________ I use mesa cabs, but I noticed teh grounding issue while playing through headphones since I don't have my cabs here at my apt. It must be a grounding issue because the hum goes away for the most part when I make contact with the strings, but I would like to htink I can ground it by doing something to the rack or the components....something... There's no ground switch on any of my components except for the Direct Out on the pre and that doesn't do anything. I should also mention that the humming goes away completely when I touch the metal on the rack... Please give me a quick, cheap and/or easy fix for this issue if possible. One additional thing...It seems like my body positioning in relation to the Rack directly effects the intensity/prevalence of the hum. Anyone? P.S. - forgot to mention that it's not this particular apt./outlet either, because it did the same thing in my bands practice area where I had never had problems with grounding on any previous amps/setups.