Circle of Fifths Harmony Instrument – Standalone, Handcrafted, Three Synthesis Models
Product Introduction
A standalone harmony instrument built around the circle of fifths. Its sonic engine draws from the overtone series, with seven individual partials for detailed timbral control. Three synthesis models: additive FM, subtractive, and granular. Hand‑assembled in a solid walnut enclosure with Cherry MX Silent Red keyswitches. Runs on rechargeable AA batteries or USB‑C. Built‑in surface transducers turn the walnut body into a speaker. USB‑MIDI and stereo 1/4" audio out. A new, expressive way to shape rich, complex harmonic textures.
Product Features
🎹 Circle of fifths interface
Major and minor triads on the outer ring. Star keys for diminished chords. Press multiple buttons at once for extended chords – 7ths, 9ths, 11ths, 13ths. Shift button plays root notes only.
🎛️ Seven‑voice additive engine
Each of the first seven overtones has its own fader. Detune partials up or down, apply frequency modulation, and shape timbre. Filter envelope with attack, decay, and slope controls. Built‑in reverb.
🔄 Three synthesis models
Original additive model – control over seven overtones. Subtractive model – triangle, PWM, saw, sine/FM oscillators with low‑pass filter. Granular model – lighter version of the original with spray, grain size, and jitter controls.
🎸 Manual arpeggiator
Strum left and right like a guitar or harp. Two strum modes. Three play modes: Immediate Trigger, Bass Line, and Arpeggiator‑Only. Open and close voicings.
🌲 Handcrafted walnut body
Assembled by hand in the USA. Cherry MX Silent Red keyswitches. Surface transducers turn the walnut enclosure into its own speaker. Runs on 4x rechargeable AA batteries or USB‑C (4‑17V). USB‑MIDI and stereo 1/4" outputs.
Product Specifications
- Material: Solid walnut (milled in USA)
- Keys: Cherry MX Silent Red keyswitches
- Synthesis: Additive FM / Subtractive / Granular
- Controls: 7 partial faders, filter envelope, reverb, arpeggiator fader
- Play modes: 3 (Immediate, Bass Line, Arpeggiator‑Only)
- Strum modes: 2 (with note‑skip detection)
- Power: 4× AA rechargeable batteries or USB‑C (4‑17V)
- Audio: Stereo 1/4" out + built‑in surface transducer speakers
- MIDI: USB‑MIDI out
Package Includes
1 × Circle of fifths harmony instrument
1 × USB‑C cable
1 × User manual
1 × (Batteries not included)
✨ The only instrument that maps the circle of fifths to a physical interface – discover chords you’ve never played before.
