Used Donner Harmonic Square Pitch Shifter Pedal

The Donner Harmonic Square is an absolute micro-sized secret weapon, packing serious polyphonic pitch shifting and octave harmonies into a footprint that barely takes up any board real estate. Built with true-bypass switching to keep your dry signal completely pristine, this bright red workhorse offers 7 distinct interval settings—±2, ±3, ±4, ±5, ±7, 1 Oct, and 2 Oct—ranging from subtle harmonic doubling to wild, synth-like two-octave jumps. A clever 3-way mode switch lets you select Sharp to shift pitches up for screaming octave leads, Flat to drop down into sub-bass rumble, or Detune for lush, double-tracked chorus textures.

What really makes this tone-shaping micro box punch way above its weight class is the ability to independently control your Wet and Dry signal levels. You can blend in just a touch of upper harmony to thicken your rhythm lines, or dime the wet signal while killing the dry for full-on pedalboard transpositions. Housed in a rock-solid aluminum alloy chassis, it’s a killer, budget-friendly way to unlock huge, experimental pitch-shifting power without having to rewrite your entire rig. This pedal is in good condition and ready for you!