Synth / plugin file

Overtonium

Benjamin Dehli (Dehli Musikk) / Free

Overtonium is Benjamin Dehli's free, open-source 32-partial additive synth, laid out like a mixer, with per-harmonic control and continuous equal-to-just microtuning.

Vollständigen Test lesen →Offizielle Website ↗
Dubspot / verified plugin database
Das Dubspot-Urteil

Das Dubspot-Urteil

Overtonium is a free additive synth laid out like a 32-channel mixer, with per-harmonic control and a continuous sweep from equal temperament to pure just intonation.

Am besten für Producers and students who want direct, per-harmonic control of a sound and deep microtuning, in a free and open-source additive synth.

Pros

  • 32 harmonics, each with its own channel strip of controls
  • Continuous TUNE sweep from equal temperament to just intonation
  • Six keyboard temperaments plus inharmonic stretch
  • DRIFT, WOBBLE and a dual-path tape echo for movement
  • Free and open source (AGPLv3), with MPE support

Cons

  • Additive design takes more patience than a preset-driven synth
  • Voice count is modest, so heavy patches can be CPU-hungry

Field notes

Überblick

Overtonium is a free, open-source additive synthesizer from Benjamin Dehli (Dehli Musikk), released in September 2026. It is laid out like a 32-channel mixer, where each channel is a sine oscillator locked to a harmonic of the played note, with its own tuning, envelope, modulation and stereo placement, plus a separate noise channel.

Its signature feature is a TUNE control that sweeps every partial continuously between equal temperament and pure just intonation, backed by six historical keyboard temperaments and an inharmonic stretch. It runs as VST3, AU, LV2 and standalone on macOS, Windows and Linux, and it is free under the AGPLv3 license. For the full breakdown, see the Overtonium first look.

Technical matrix

Spezifikationen

Type
Additive synthesizer (32 partials plus noise)
Sound source
32 sine oscillators locked to harmonics, plus a noise channel
Per-partial control
Around 23 controls per channel strip
Tuning
Continuous equal-to-just TUNE sweep, inharmonic stretch
Keyboard temperaments
Equal, just, Pythagorean, quarter-comma meantone, Werckmeister III, Young
Effects
DRIFT, WOBBLE, dual-path tape echo
Expression
MPE, per-note pitch bend and pressure
Formats
VST3, AU (macOS), LV2 (Linux), standalone; macOS, Windows, Linux

Zuletzt geprüft 2026-09-29

Quick reference

FAQ

Is Overtonium free?

Yes. Overtonium is free and open source under the AGPLv3 license, with downloads and source on the developer's project page and GitHub. No account is required.

What makes Overtonium unusual?

It is an additive synth laid out like a 32-channel mixer, with direct control of each harmonic, and it can sweep every partial continuously between equal temperament and just intonation.

What formats does Overtonium support?

VST3, AU (macOS), LV2 (Linux) and standalone, on macOS, Windows and Linux, with MPE for per-note expression.

Comparison matrix

Direkte Konkurrenten

Overtonium vs — head-to-head specs, price, and Dubspot Score.

Vital9.0
Overtonium vs Vital
Vergleichen →
Pigments 68.9
Overtonium vs Pigments 6
Vergleichen →
Serum 29.2
Overtonium vs Serum 2
Vergleichen →

Adjacent signals

Verwandte Plugins

Further routing

Siehe auch

Alle besten synth-Empfehlungen →

Verwandte Artikel