— From the community
Videos & links
4 videos and 17 articles, threads and project pages that explain SLOOP well. Each one also appears beside the guide section it covers. Videos load from YouTube only when you press play.
Sloop - Firmware for the M-VAVE FM-1 Complete tour
3dSam
A seven-minute tour of SLOOP 2.2 from 3dSam, the channel behind SLOOP, played on SLOOP itself. Much has been added since, but the layers it shows work the same way.
a fairly deep dive into sloop v2.3 (m-vave fm1 custom firmware)
BIG UMAMI
Twenty-four minutes cut from a two-hour live stream on version 2.3, starting from a blank project. Older than 2.8 — 76 sounds then — but the workflow carries over.
SLOOP 2.8 Completely Changes How You Sequence on the FM-1
PhilipsKnobs
A first look on 2.8’s release day: building a loop from scratch with the new piano-roll sequencer — note lengths, chords and drum patterns.
Using the M-VAVE FM-1 with SLOOP Custom Firmware | First Go
Darren Lock Music
A first session from early October: jamming with SLOOP, first impressions and a look at the browser editor. By its own description, a first go rather than a full review.
SLOOP project pages
- SLOOP on GitHubisod89 · 2026-11 — The project page: what SLOOP does, the specifications, compatibility, installing, rescue and the issue tracker. 767 stars in November 2026.
- SLOOP 2.8.5 — The Complete Guide (GUIDE.md)isod89 · 2026-11 — SLOOP’s own reference in 26 chapters, with a one-page cheat sheet at the end. Every section here names the chapters it was written from.
- SLOOP manual and version history (SLOOP.md)isod89 · 2026-11 — The shorter manual, with the full list of factory sounds and kits and what changed in every version since 2.0.
- SLOOP installerisod89 — Installs and updates SLOOP from Chrome or Edge over USB; nothing to download. Also offers the offline editor.
- SLOOP web editorisod89 — The browser editor: every parameter, the sequencer and piano roll, samples, drum kits, the LIVE page and backups. Add ?mock=1 to try it without an FM-1.
- SLOOP releasesisod89 · 2026-11 — Every version’s firmware file (.fwsc) and the offline editor, with release notes. The way back to an older SLOOP.
- FeluccaHügelton Instruments — Leo Kuroshita’s open-source FM-1 firmware that SLOOP is built on: the engines, the sequencer and much of the MIDI and audio code come from it.
- Felucca wikiHügelton Instruments — Background on the engines SLOOP shares with Felucca. Felucca’s own controls differ from SLOOP’s, so use it for the ideas, not the buttons.
- Clipper installer: Return to the official firmwareisod89 — The fallback SLOOP’s README gives for going back to stock when M-UPGRADE can’t see the FM-1. It works with SLOOP installed; you don’t need to install Clipper.
- FM-1-transporterkurogedelic — The last-resort recovery tool SLOOP’s README points to for an FM-1 that no longer starts at all. It needs extra hardware and wiring.
- M-VAVE downloads (M-UPGRADE and the FM-1 firmware)M-VAVE — Where M-UPGRADE (under PC Software) and the official FM-1 V16 firmware, FM-1.fwsc (under PC Firmware), live.
Forum threads
- Install of latest SLOOP on new MVave FM-1 bricked the device (#185)SLOOP issues · 2026-10 — A new unit went black after “Verify 2” during a Windows install; the developer’s reply explains why SLOOP’s rescue modes could not help.
- Go Back to Stock Firmware dont work (#186)SLOOP issues · 2026-10 — The old in-browser return to stock stalling on Windows, and the developer’s advice to use M-UPGRADE instead.
- Install on stock V16 (Mac): "USB connection was lost" / "loader was disconnected after 3 requests" (#239)SLOOP issues · 2026-11 — Repeated install failures from a Mac on stock V16; the unit kept booting into V16. Open, with no reply yet when checked.
- M‑UPG error 258 (SLOOP 2.8.5 return to the official V16 firmware ) (#249)SLOOP issues · 2026-11 — M-UPGRADE timing out with error 258 when going back from 2.8.5 to V16. Open, with no reply yet when checked.
- M-vave fm-1Elektronauts · 2026-06 — The long-running FM-1 thread. From October owners compare SLOOP with the other firmwares — opinions run from “super easy to use” to wanting deeper synthesis.