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arplus, image 1 from its README
Firmware

arplus

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Quantizer, arpeggiator, and string synthesizer in a single module.

arplus is custom firmware for the Zlosynth Arplus, by @zlosynth. Open source under CC-BY-SA-4.0, latest release v1.0.1 (April 2026), 8 stars on GitHub.

forZlosynth Arplus·by@zlosynth

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

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Arplus

Quantizer, arpeggiator, and string synthesizer in a single module.

Photo of the module

  • Karplus-Strong string synthesis with 6-voice polyphony
  • External audio input for custom excitation sources
  • 31 different scales and chords of up to 8 notes
  • Configurable scales
  • CV-controllable arpeggiator patterns
  • Quantized 1V/oct output
  • Three different stereo output modes
  • 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.

License

Software of Kaseta 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.

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

Derivative work

This project is open-source. As long as you comply with the license, you're free to study the code, copy it, modify it, build your own module, and even sell it.

However, if you choose to sell your own build, please do not use the name "Zlosynth" on the panel, and clearly state in the description that it is a clone.

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.

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 firmware/src/main.rs.