I have noticed an issue with compressors or any boost pedal that I have used. My main lead pedals are either a Big Muff or a Tube Driver and I always have something not only to boost them but to also function as an EQ for them. Right now I am using a Barber Tone Press but I have gone through many others, (vintage TS-808, DynaComp, RC Booster, Keeley Compressor etc). They always, ALWAYS buzz and hum like crazy when they're on with on the lead pedals, but are quiet when just used alone or with some modulation. Humbuckers and single coils. Can anyone explain to me why they do this and if there is anything that can be done about it??