Used MXR M103 Octave Blue Box Effect Pedal

Used in excellent condition, the MXR M103 Blue Box Octave Fuzz pedal delivers a unique blend of vintage fuzz and down-octave effects. It generates a thick, synth-like tone by fuzzing your guitar signal and adding a signal two octaves down. With just two controls—Output and Blend—you can dial in everything from subtle warmth to wild, glitchy textures. Powered by a 9V battery or adapter, it’s a classic addition to any pedalboard.