Quord is a four-voice sawtooth drone synthesizer and "harmony exploration machine" designed for ear-based tuning. It features a resonant filter that acts as a fifth voice, a distortion circuit, and long-throw sliders for precise manual control over harmonic intervals.

The long sliders control four pitches. Carefully slide them to find pockets where two, three, or more voices sit together - either with ease or with tension. The pitch ranges of the oscillators are limited from bass to alto to allow for some tuning precision by hand. Quord lacks a traditional keyboard. Instead you play it by tuning the oscillators. If Quord were an acoustic instrument, it would be like a guitar that you play by retuning the strings.

The four short mixer sliders combine the sawtooth voices into one sound stream. The mix flows into a filter (yellow) followed by a distortion (red). The filter tames the sound before the distortion adds edge, highlights beating rhythms, and glues the sound together.

Surprisingly, the resonance works great as a fifth voice. At the right settings, it latches onto overtones of the blended sawtooth waves, combining to make a new musical scale that always complements the drone. Simple melodies can be teased out for ancient campfire music.