Why should guitar players have all the fun? Electro-Harmonix delivers the warmest, fuzziest low-end goods imaginable with the Bass Big Muff Pi. While taking the best of the old "Green Box" Russian Muff and the 1970s Big Muff Pi, EHX steps up the bottom with the Bass Big Muff Pi and optimizes this fuzz machine for bass guitar. It's a little easy to get out of control with this beast, so a direct output of the dry signal is available to blend in with the harmonic madness.