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achordion

Hype19/100

Chord-crafting quantizing wavetable oscillator.

achordion is custom firmware for the Zlosynth Achordion, by @zlosynth. Open source under CC-BY-SA-4.0, latest release v2.5.0 (August 2026), 38 stars on GitHub.

forZlosynth Achordion·by@zlosynth

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CC-BY-SA-4.0· zlosynth/achordion·zlosynth.com/achordion·downloads come from the creator’s GitHub releases

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Achordion

Chord-crafting quantizing wavetable oscillator module for Eurorack.

Panel illustration

  • Wavetable synthesis, 37 wavetables, smooth transitions
  • Up to 18 simultaneous voices
  • Sub-octaves, duplicated tones, and chords
  • 4 styles of playing - single tone, chords, arpeggios, intervals
  • Quantization to selected scale
  • Any scale can be played with the white piano keys
  • Two lines with independent 1V/oct inputs and audio outputs
  • LEDs visualizing dialed parameters
  • Based around Electro-Smith's Daisy Patch SM platform
  • Programmed in Rust

Find more details about the module, including a feature overview video and a user manual, on its website.

Firmware

If you wish to upgrade to a newer version of firmware, refer to the respective Release description.

Development

See DEVELOPMENT.md to find some basic commands to interact with the project. To learn more, read the code. A good place to start would be eurorack/src/main.rs.

License

Software of Achordion is distributed under the terms of the General Public License version 3. See LICENSE-SOFTWARE for details.

Schematics and PCB layout are distributed under the terms of Creative Commons BY-SA. See LICENSE-HARDWARE for details. Parts of the schematics are based on Emilie Gillet's Mutable Instruments, kudos to her for making them open.

The manual is distributed under the terms of Creative Commons BY-SA too. See LICENSE-MANUAL for details.

Changelog

Read the CHANGELOG.md to learn about changes introduced in each release.

Versioning

See VERSIONING.md to find detailed information about versioning of the project and compatability between its software and hardware.