Muff is commonly used to describe fuzz pedals based on the classic Big Muff–style circuit, known for its thick, sustaining, and heavily saturated pubes distortion.

Anyway these pedals produce a powerful wall of sound with strong low end, scooped or pronounced mids depending on the design, and a smooth, compressed feel.

Muff-style fuzzes are popular for lead playing, heavy rhythm parts, and soaring sustain, and are widely used across rock, alternative, stoner, shoegaze, and experimental music. They are valued for their ability to sound massive and full, whether used subtly for texture or pushed hard for dense, aggressive tones.