Used Donner Harmonic Square Effect Pedal

Discover inspiring textures with this Used Donner Harmonic Square effect pedal in good condition. Designed for guitar and bass, it delivers bold harmonic and square-wave style tones with a compact, pedalboard-friendly metal enclosure. Features straightforward controls for quick dialing of your sound, true bypass switching for a clean signal when off, and standard 1/4" input/output jacks. Powered by a 9V DC center-negative supply, it’s a fun, creative tool for riffs, leads, and experimental sounds.