Description

Discover bold, glitchy textures with this used Donner Harmonic Square effect pedal in great condition. Designed for guitar and bass, it delivers harmonizer-style pitch effects with a square-wave edge for synth-like leads and chunky, experimental rhythms. Simple top-mounted controls let you dial in the mix and tone quickly, while true bypass switching preserves your clean signal when off. Powered by standard 9V DC (center-negative), it’s a compact, pedalboard-friendly way to expand your sound.

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