M103 Blue Box Octave Fuzz

The MXR M103 Blue Box Octave Fuzz is a unique guitar effect pedal that generates a huge, subterranean tone by duplicating your guitar signal two octaves down, creating a heavy fuzz effect. The Blend control lets you mix the fuzz with the two octaves down signal. This pedal is famed for its use by Jimmy Page, particularly in the solo from Led Zeppelin's "Fool in the Rain".