EHX deluxe Big Muff Pi - most versatile fuzz pedal I know 

this is the electro harmonix deluxe Big Muff. a Fuzz pedal that runs via 9v powersupply.
it can create all the classic ehx NYC Big Muff sounds, but also a whole lot of other cool sounds thanks to the mid frequency knob, a bass boost, and a noice gate.
you can also plug an expression pedal into it to control the mid range.
I'm using my ESP LTD EX-50 with active EMG pickups (James Hetfield signature)
a Boss OC-3, a Marshall Echohead, and my Behringer V-Tone gmx 1200h amplifier with a Harley Benton 1x12 Cab with Celstion V30.