FuMi-1

A held physical key, including an ornament key, selects bending. A loop or MIDI note by itself does not count as a held panel key. Bending targets the newest live note, while recorded bends have a separate target in the loop.

余韻 (Yoin) is how long a released note rings. EQUAL is 平均律, equal temperament; SUIKO is the release’s measured ST-50 純正律 offsets. KOTO uses its pure-interval table, and USER uses saved per-degree trims, although this release provides no panel editor for those trims. 颪 (Oroshi) is a trill that begins slowly and accelerates.

Home page

Sound page

Bend page

Tuning page

Loop page

Trill page

Trill 2 page

Power-off writes nothing; the loop is lost and unsaved setup edits can be lost.

An edit must mark the setup unsaved, all keys and buttons must be released, no voices may remain, the loop must be empty or stopped, and four seconds must have elapsed on the activity timer; KNOB 1–4 and button activity reset it, but SELECT, PRESETS and ALGORITHM do not.

SAVE before updating; if an update returns without installing, reinitialising the UI clears the unsaved flag without saving the pending setup, so use SAVE again before powering off.

SAVE can interrupt sound while flash is erased, even if a loop is running; it does not wait for the quiet conditions used by autosave. A completed calibration also replaces its saved map without a question or undo; an unfinished attempt writes nothing.

The chip updater can also be requested over USB and starts automatically after four consecutive failed starts.

Live note output normally uses MIDI channel 1. Loop playback sends no MIDI notes. Unlike FoMni v0.4, this firmware has no screen-reader text output.

The saved light preference defaults to key lights with dim button glow; this release has no panel control to change it. Page and feature lamps still show their states.

• Back up first. Before installing or first starting FuMi-1, back up using the firmware that created the work. FuMi-1 has no ordinary setup or loop backup and no restore command: note setup values and, while FuMi-1 runs normally, record its master mix over USB into a computer recorder before switching off; this preserves loop audio rather than editable loop events. The browser audition bench exports its own session and patch choices, not the unit’s setup or loop. The separate recovery tool can read a complete flash image before returning a unit in chip download mode to stock, but excludes the memory-only loop and supplies no FuMi-1 dump restore.

FuMi-1 stores one setup, including instrument, tuning, effects, playing choices, loop ruler and click, plus separate button and encoder calibration; it does not save recorded loop notes, audio, retained layer instruments or a temporary external patch. The current loader accepts its newer setup and converts setups from FuMi-1 1.0.4/1.0.5 in memory, committing the new form only on a later save or autosave.

FoMni’s musical setup is not imported, although its compatible calibration is reused. See the switching advice in this section for the affected saved work. Returning to FoMni does not read the FuMi-1 setup. Write down values before going back to an older FuMi-1 release. Back up before switching.

Startup can erase leftover data in the update area without a question, before safe mode as well as ordinary operation; it does so only when its update-area probes find occupied bytes. See the switching advice in this section for the affected saved work. Beginning an installer update also erases this area, including after a refused or failed attempt. Installing replaces the program area; the recommended return through stock carries further data risks. The loader also erases any sector in its data scan that contains a valid update record. It does not ask before these erases. These update-area erases also remove X0X’s pending USB restore and Polly’s pending restore information; keep their restore files.

The first SAVE or eligible quiet autosave, and every later save, writes a shared setup sector without a question. See the switching advice in this section for the affected saved work. A first save may leave one older copy, but further saves can overwrite both: do not rely on a surviving copy.

Completing hardware calibration writes immediately without a question. See the switching advice in this section for the affected saved work. Compatible calibration from FoMni, AMB-1, Polly, FiMba-1 and Fart Machine One can instead be reused. An incomplete calibration times out without a flash write; a completed attempt does not report whether its flash save succeeded. These writes can also replace ChoralRoot’s legacy sounds 1–16, kept for returning to ChoralRoot 0.21 or older.

See the switching advice in this section. Back up or note your values before switching.

The cross-firmware loss statements are inferred from this release’s write behavior and checked storage layouts, not measured on a unit.

• Back up in the firmware you are leaving first, with its own tool (above). Anything below marked at risk can be written over; whether an older saved copy survives depends on how often you saved, so do not count on it.
• What installing FuMi-1 does to the firmware you had before.
  Show the detail

  install (FuMi update loader): After checking chip key, replaces unequal program sectors only, verifies each, never writes the protected flash head (each successful FuMi installation/update; equal sectors skipped). install (update-record cleanup): After installation, clear only valid update-record sectors. Ordinary saved projects, sounds and samples are not update records (After an install, erase only a 4 KiB sector whose last 256 bytes hold a valid update record (marker 0x5441 at +6 and a matching nonzero CRC16 over bytes 2..79): in practice the family staging-record sector 0xE4000 and, on a first install from stock, stock record sector 0xE8000. Saved music does not hold that record. This loader does not skip 0x97000-0xDFFFF). startup before normal or safe mode: Conditionally erases the entire five-sector update area; foreign bytes count as occupied, not only a FuMi header. No setup/calibration save is performed at startup (expected flash JEDEC accepted and first 4 bytes at E0000 or first 8 at E4F00 contain a non FF byte). update departure, failed update, or dry run: Starting an incoming recognized package erases all five sectors before staging. A refused/failed/dry-run ota_session also erases all five, even if refusal happened before successful staging. Does not ask before erasing foreign data (ota_session entered by installer upgrade request while flash is accepted). return to stock from web installer: Page accepts exactly the SHA256-checked stock V15 package. The firmware accepts the known official loader only if its protected flash-head bytes match the running unit. A comment describes the stock loader as rewriting its full image; that loader implementation is not supplied, so no additional exact stock erase footprint is asserted (owner selects the stock file and starts the return). optional UBOOT recovery tool returns to V15: Reads and saves the entire 1 MiB flash before writes; --write or --ask approval permits only unequal program sectors, high to low, with verification. Device-data area at 93000 and above is carried through this tool, although subsequent stock behavior is not established. This is a stock recovery path, not a restore of a prior FuMi dump (unit in WL82 UBOOT, supported chip/flash, exact approved V15 file, protected head identical, writing requested).

  • Stock V15: Possibly at risk: stock settings (and possibly patterns). At start-up, FuMi-1 erases the space where firmware updates are prepared if a checked spot there holds data. This can erase stock data in that space. The exact locations of stock saved data are only reported.
  • Baud Girl FM-1+VA: Possibly at risk: Baud Girl presets (128); Baud Girl patterns (16, with locks). At start-up, FuMi-1 erases the space where firmware updates are prepared if a checked spot there holds data. This can erase Baud Girl’s saved work if it sits in that space, including the checked spots. Exact saved-data locations are unknown.
  • Felucca: At risk by itself: settings, button calibration, favourites, MIDI LEARN map. At risk when you act: user presets 1-16.
  • SLOOP: At risk by itself: settings, calibration, song order, SYN1-4 kits, MIDI LEARN, theme and favourites. At risk when you act: user sounds U01-U16.
  • X0X: At risk by itself: the whole X0X project (settings, sound, all 32 patterns, song, knob motion). At risk when you act: X0X button calibration. Before leaving X0X, stop playback and back up its project over USB. One save or automatic save in FuMi-1 can make X0X load defaults for its whole project when you return, including sounds, patterns, song and knob motion. Restore the X0X backup after reinstalling X0X; the older stored copy cannot be used as a backup.
  • JIANT: At risk by itself: settings, calibration, favourites, MENU options. At risk when you act: user sounds U01-U16.
  • Melodee: At risk by itself: settings, factory favourites, calibration, saved template. At risk when you act: shared user presets U001-U018.
  • FoMni: At risk by itself: FoMni setup (pages, chord buttons, lights). Carried over: FoMni button calibration. After FuMi-1 saves its setup, going back to FoMni uses its default setup. FoMni’s own last save may still be stored, but FoMni will not load it. Later FuMi-1 saves write over it.
  • AMB-1: At risk by itself: AMB-1 pieces and setup. Carried over: AMB-1 panel calibration.
  • ChoralRoot: At risk by itself: options, playing setup and panel calibration.
  • GHOULBOX: At risk by itself: settings and panel calibration. At risk when you act: user sounds 1–16.
  • M-VAVE FM-1 Open: At risk by itself: Open shared sample audio. At risk when you act: Open USER project 1; Open USER project 2; Open USER project 3; Open USER project 4; Open USER project 5; Open USER project 6; Open USER project 7; Open USER project 8; Open USER project 9; Open USER project 10; Open USER project 11; Open USER project 12; Open USER project 13; Open USER project 14; Open USER project 15; Open USER project 16; Open device preferences. Installing replaces Open’s sixteen USER projects, preferences and the information needed to read its sample bank, including the start of its sample storage. Export projects and the device sample bank before leaving Open. The required return through stock firmware has other unchecked data risks. At start-up, FuMi-1 erases the space where firmware updates are prepared if a checked spot there holds data. This can erase Open sample audio if the bank reaches that far. Export the device sample bank before leaving Open.
  • FM-106: At risk by itself: octave, last selected preset and MIDI preferences.
  • Hortator: At risk by itself: settings and panel calibration.
  • OberVave: At risk by itself: saved programs and global settings; pattern 1 (its B-track sound can change if it uses a saved program; its pattern notes remain); pattern 2 (its B-track sound can change if it uses a saved program; its pattern notes remain); pattern 3 (its B-track sound can change if it uses a saved program; its pattern notes remain); pattern 4 (its B-track sound can change if it uses a saved program; its pattern notes remain); pattern 5 (its B-track sound can change if it uses a saved program; its pattern notes remain); pattern 6 (its B-track sound can change if it uses a saved program; its pattern notes remain); pattern 7 (its B-track sound can change if it uses a saved program; its pattern notes remain); pattern 8 (its B-track sound can change if it uses a saved program; its pattern notes remain).
  • Polly: At risk by itself: Polly setup and channel sounds. Carried over: Polly button and encoder calibration.
  • Skiff: At risk by itself: settings, calibration and favourites. At risk when you act: user sound bank 1.
  • sloopDX: At risk by itself: settings, calibration, song order, MIDI, theme and favourites. At risk when you act: user presets 1–16.
  • Rainbow Mode: At risk by itself: Felucca preferences, calibration and favourites; Rainbow WRITE song, greeting name, hat, volume limit and look-alikes. At risk when you act: user sounds U01–U16, names and sixteen-step patterns without automation.
  • DUELL beta: At risk by itself: settings and panel setup. At risk when you act: saved patches.
  • FiMba-1 beta: At risk by itself: FiMba-1 beta sound and playing setup. Carried over: FiMba-1 beta panel calibration. After FuMi-1 saves its setup, going back to FiMba-1 uses its default setup. FiMba-1’s own last save may still be stored, but FiMba-1 will not load it. Later FuMi-1 saves write over it.
  • MAKU: At risk by itself: settings and calibration. At risk when you act: inherited user preset bank 1.
  • Fart Machine One: Carried over: learned button and encoder calibration.
  • fm1-chord: At risk by itself: settings, panel calibration, four chord preset setups and the current chord setup. At risk when you act: user sounds 1-16.
  • SLOOP DX7 Banks: At risk by itself: settings, calibration, song order, synthesized drum kits and DX-bank setup. At risk when you act: user sounds 1–16. Saving a FuMi-1 project can remove DX7 Banks’ saved count of DX banks already set up. An older copy of the settings can survive the first save. Without that count, DX7 Banks erases DX banks 1–8 at its next start without asking, including your own banks 5–8. Back up your DX banks before switching.
  • Jangada: At risk by itself: preferences, calibration and MIDI LEARN map. At risk when you act: user sounds U01-U16.
  • WaveLoop FM-1: At risk by itself: settings, calibration and favourites. At risk when you act: user sounds 1–16.
  • ORBIT: At risk by itself: settings, calibration, song order, SYN1-SYN4 kits and MIDI preferences; saved section A (sounds can change or stop playing when separate samples, FM6 patches or SYN kits are replaced; saved notes and sound settings remain); saved section B (sounds can change or stop playing when separate samples, FM6 patches or SYN kits are replaced; saved notes and sound settings remain); saved section C (sounds can change or stop playing when separate samples, FM6 patches or SYN kits are replaced; saved notes and sound settings remain); saved section D (sounds can change or stop playing when separate samples, FM6 patches or SYN kits are replaced; saved notes and sound settings remain); working music kept by autosave (sounds can change or stop playing when separate samples, FM6 patches or SYN kits are replaced; saved notes and sound settings remain). At risk when you act: USER sounds U01-U16.
  • SLOOP Floyd FM: At risk by itself: settings, panel calibration and song order. At risk when you act: user sounds U01–U16.
  • winampFM Synth: At risk by itself: settings, panel calibration, song order, SYN kits and MIDI. At risk when you act: user sounds 1-16.
  • Bubba Machine (beta): At risk when you act: screen language pack; system preferences and last pattern.
  • Felucca [Salt]: At risk by itself: screen preferences, calibration and favourites. At risk when you act: user sounds U01-U16.
  • PIGEON: At risk by itself: preferences, MIDI LEARN and panel calibration. At risk when you act: shared song and drum sample bank; older user preset bank 1. If your PIGEON sample bank reaches the storage that installing FuMi-1 writes over, PIGEON can no longer read any of the bank, either song or the kit. Export the PIGEON session and audio bank before switching.
  • FM1 Move: At risk by itself: settings, calibration, SYN kits and stored MIDI mappings; project 1 (sounds can change or stop playing when separate samples, FM6 patches or SYN kits are replaced; saved notes and sound settings remain); project 2 (sounds can change or stop playing when separate samples, FM6 patches or SYN kits are replaced; saved notes and sound settings remain); the working project kept by autosave (sounds can change or stop playing when separate samples, FM6 patches or SYN kits are replaced; saved notes and sound settings remain). At risk when you act: user sounds U01–U16.
  • FM1 Quest: At risk by itself: settings, panel mapping, song order and Quest preferences/progress. At risk when you act: user sounds U01–U16.
  • Groove OS: Possibly at risk: Groove project slot 1; Groove project slot 2; Groove project slot 3; Groove resume autosave; Groove sound bank A; Groove sound bank B; Groove sound bank C; Groove sound bank D; Groove custom drum sounds and kits; Groove device preferences; Groove crash reports. Where Groove OS saves data and which firmware can read it are not public. Back up its projects and your own sounds separately before switching. It is not known whether they survive this switch.
• What the next firmware does to FuMi-1's data.
  • Stock V15: Possibly at risk: FuMi-1 button and encoder calibration.
  • Baud Girl FM-1+VA: Possibly at risk: FuMi-1 button and encoder calibration.
  • Felucca: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration. If no readable older shared settings copy remains, beta 2ND CORE stays OFF by default. These settings do not turn it on.
  • SLOOP: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • X0X: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration. A saved setup from the other firmware can make X0X use defaults for its whole project when you return, including sounds, patterns, song and knob motion. Automatic saving is then on. If you backed up X0X before leaving it, restore that backup after installing X0X; X0X cannot load the older stored copy on its own. After you confirm a restore on the computer, X0X starts erasing before asking again on the FM-1. Saying no keeps X0X’s current project but does not bring back erased data from your previous firmware, even if the computer says nothing changed.
  • JIANT: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • Melodee: At risk by itself: FuMi-1 sound and playing setup. At risk by itself, under a condition: FuMi-1 button and encoder calibration.
  • FoMni: At risk by itself: FuMi-1 sound and playing setup. Carried over: FuMi-1 button and encoder calibration. After FoMni saves its setup, going back to FuMi-1 uses its default setup. FuMi-1’s own last save may still be stored, but FuMi-1 will not load it. Later FoMni saves write over it.
  • AMB-1: At risk by itself: FuMi-1 sound and playing setup. Carried over: FuMi-1 button and encoder calibration. The saved button and encoder mapping carries over. This does not import saved pieces, songs, clips or sound choices.
  • ChoralRoot: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • GHOULBOX: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • M-VAVE FM-1 Open: At risk when you act: FuMi-1 button and encoder calibration; FuMi-1 sound and playing setup.
  • FM-106: At risk by itself: FuMi-1 sound and playing setup. FM-106 Beta4 does not save edited user sounds, even when it says the save worked. Export them before turning off the FM-1 or changing firmware again.
  • Hortator: At risk by itself: FuMi-1 sound and playing setup.
  • OberVave: At risk by itself: FuMi-1 sound and playing setup.
  • Polly: At risk by itself: FuMi-1 sound and playing setup. Carried over: FuMi-1 button and encoder calibration. The saved button and encoder mapping carries over. This does not import saved pieces, songs, clips or sound choices. After you agree to restore on the computer, Polly starts erasing before the FM-1 asks. Saying no on the FM-1 keeps Polly’s current project, but cannot bring back erased data from your previous firmware, even if the computer says nothing changed.
  • Skiff: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • sloopDX: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • Rainbow Mode: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • DUELL beta: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration. The installer starts with its erase option selected for this firmware change. Clear it before installing to avoid this extra erase.
  • FiMba-1 beta: At risk by itself: FuMi-1 sound and playing setup. Carried over: FuMi-1 button and encoder calibration. After FiMba-1 saves its setup, going back to FuMi-1 uses its default setup. FuMi-1’s own last save may still be stored, but FuMi-1 will not load it. Later FiMba-1 saves write over it.
  • MAKU: At risk when you act: FuMi-1 sound and playing setup.
  • Fart Machine One: Carried over: FuMi-1 button and encoder calibration. Fart Machine One does not import or save a music setup or loop. SAVE does nothing. Its recorded loop, tempo and effect choices last only while it stays on. Calibration is separate.
  • fm1-chord: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • SLOOP DX7 Banks: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • Jangada: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • WaveLoop FM-1: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • ORBIT: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • SLOOP Floyd FM: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • winampFM Synth: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • Bubba Machine (beta): At risk by itself: FuMi-1 button and encoder calibration.
  • Felucca [Salt]: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • PIGEON: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • FM1 Move: At risk when you act: FuMi-1 button and encoder calibration; FuMi-1 sound and playing setup.
  • FM1 Quest: At risk by itself: FuMi-1 sound and playing setup. At risk when you act: FuMi-1 button and encoder calibration.
  • Groove OS: Possibly at risk: FuMi-1 sound and playing setup; FuMi-1 button and encoder calibration. The official route first puts V15 back, then installs Groove OS. Treat this firmware’s saved work as lost and back it up with its own tools before starting. Groove OS’s project saves, autosave, preferences, sample uploads and extra installed pages can also replace leftover work; nobody has published which parts of storage they use. A sound missing from PRESETS may still occupy storage, and do not count on Groove OS’s own backups to keep it.
• Who reads whose data. Other firmwares reading FuMi-1's data: FoMni reads and uses FuMi-1's FuMi-1 button and encoder calibration; FiMba-1 beta reads and uses FuMi-1's FuMi-1 button and encoder calibration; Fart Machine One reads and uses FuMi-1's FuMi-1 button and encoder calibration; AMB-1 reads and uses FuMi-1's FuMi-1 button and encoder calibration; Polly reads and uses FuMi-1's FuMi-1 button and encoder calibration. What FuMi-1 reads of other firmwares' data: FuMi-1 reads and uses FoMni's FoMni button calibration; FuMi-1 reads and uses AMB-1's AMB-1 panel calibration; FuMi-1 reads and uses Polly's Polly button and encoder calibration; FuMi-1 reads and uses FiMba-1 beta's FiMba-1 beta panel calibration; FuMi-1 reads and uses Fart Machine One's learned button and encoder calibration. Everything else of another firmware's looks empty or foreign to the reader.
• Every way each write can happen, for all mapped firmwares: the flash atlas's table.

• The browser audition bench and computer keyboard shortcuts are separate interfaces; their session and patch exports are not unit setup or loop backups.
• No panel selector was found for lights, MIDI output enable, output Level, vibrato rate, USER per-degree trims or slide enable; these stored parameters are not invented as panel controls.
• A full checkout of the recorded upstream base b81eb6b661c35948ec2d1059664d4e5790999305 was not supplied; the complete tree comparison uses the supplied FoMni v0.4 tree, with the recorded base and protected-path intent read in docs/upstream.md and tools/guard_platform.sh.
• Whether older FuMi releases accept the setup written by this release is not established by the supplied tree; current code reads formats 2 and 3 and always writes format 3.

Mapped from cartesive/fumi-1 at fumi-1.0.7 (c83d2c4), 2026-10-17. An independent checker found zero errors in round 3 (2026-10-17). Control claims were traced to this release’s source; pinned evidence is in [fumi.json](fumi.json). The storage fragment is fumi.storage.json.

Firmware licensing: GPL-3.0-only, with an Apache-2.0 synthesis component and SIL OFL fonts. This independently written guide is unaffiliated with the firmware authors, M-VAVE or Suikohsha.