A fuzzbox is a guitar effects box comprising an amplifier and a clipping circuit, which generates a deliberately distorted version of the input signal.

The generated signal is rich in extra harmonics of the input signal, particularly odd harmonics, and will also produce cross-modulation between any non-harmonic components of the input signal, leading to dissonance. For this reason, power chords are often used when using fuzzboxes, to reduce dissonance.

The fuzzbox is associated with rock music, particularly its heavy metal genre.

Fuzzbox is also an all-women punk band.

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