Used Donner Harmonic Square Effect Pedal

Add shimmering octave textures and rich harmonies to your rig with this used Donner Harmonic Square effect pedal in good condition. Compact and pedalboard-friendly, it delivers fast tracking and a wide tonal range for lead lines, ambient swells, and punchy riffs. Simple top-mounted controls make dialing in your blend quick and intuitive, while standard 1/4" input/output and 9V DC power (center-negative) keep it compatible with most setups.