Used MXR M103 Octave Blue Box Effect Pedal

The used MXR M103 Octave Blue Box Effect Pedal delivers vintage fuzz with a distinctive two-octave-down synth sound that’s perfect for experimental tones and crushing riffs. Featuring separate control knobs for Output and Blend, it lets players dial in the right balance of fuzz and sub-octave effect. This pedal is housed in the classic MXR blue chassis and is known for its wild and unpredictable analog response that’s inspired generations of guitarists. The unit runs on a standard 9V battery or AC adapter (not included) and is in good condition with light cosmetic wear and fully functional electronics. Whether you're aiming for Sabbath-style heaviness or quirky, glitchy textures, this pedal offers a unique voice that stands out in any setup. A true classic for tone chasers and sonic adventurers alike.