SLOOP Floyd FM
SLOOP fork that adds a 4-operator FM engine with per-operator envelopes, a seven-page editor and an on-screen envelope and voice display.
by renebohne
Brick risk. Flashing this carries a known, documented risk of damaging the device.
- Distribution
- Prebuilt image you flash yourself
- License notes
- Inherited from SLOOP and Felucca.
- Source
- github.com https://github.com/renebohne/sloop-fm1
- Homepage
- github.com https://github.com/renebohne/sloop-fm1/releases/tag/v2.4
- synth-engine
- fm
- ui
- sequencer
Description
Based on SLOOP, with the engine's pages for algorithm, operators 1 to 4, level and ratio. The release notes credit Floyd Steinberg's 4-operator FM concept video and Jonathan Zeppa's FloydFM plug-in as the inspiration. The tagged 2.4 release also merges SLOOP 2.3. The main branch has since been resynced with upstream SLOOP, and the engine's design notes are in FLOYD.md on the tag and on the feature branch.
Install notes
Download sloop-2.4.fwsc (a felucca-2.4.fwsc package is attached as well) from the release and install it with the SLOOP web installer or tools/fm1_install.py. Roll back with M-UPGRADE or the installer.
Version history
| Version | Date | Notes |
|---|---|---|
| 2.4 | 2026-10-06 | |
| 2.2-visual-fm | 2026-10-05 | Adds the visual FM editor and an option to light the keys of notes that sound. |