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Electro Harmonix Metal Muff Metal Muff Electro-Harmonix spent many months creating what we believe to be the best heavy metal pedal ever built. The Metal Muff utilizes three powerful EQ bands, including a midrange control designed for perfect contouring. Along with beautifully sculpted mids, the Metal Muff offers commanding bass and defined top end—coupled with user-controlled distortion from pinched-edge to totally crushing—making it a heavy metal gold mine. Currently Out Of Stock