Used Donner Harmonic Square Effect Pedal

This Used Donner Harmonic Square Effect Pedal, in excellent condition, delivers bold harmonic texture and synth-like square-wave bite in a compact, pedalboard-friendly enclosure. Simple, responsive controls make it easy to dial in everything from subtle edge to aggressive, gated fuzz tones. Built with a rugged metal housing and standard 1/4" input/output, it runs on 9V DC center-negative power and is designed for quiet, reliable performance on stage or in the studio.