Used MXR M103 Octave Blue Box Effect Pedal

The Used MXR M103 Blue Box Octave Effect Pedal delivers rich, vintage-inspired fuzz with a powerful analog octave-down feature, making it a must-have for guitarists seeking unique, synth-like tones. This pedal blends a thick, square-wave fuzz with a deep sub-octave, controlled by Output and Blend knobs for precise sound shaping. Featuring true bypass switching, it preserves your tone when disengaged. Built with MXR’s legendary durability, this unit is in great condition, ensuring reliable performance. Powered by a 9V battery or optional AC adapter, this compact pedal is perfect for on-the-go musicians. Whether you're crafting deep, growling bass textures or soaring, glitchy octave effects, the MXR M103 Blue Box delivers an unmistakable sound used by legendary artists. Add this classic effect to your rig and unlock a world of sonic possibilities.