Les

FM-1 firmware · v0.1.0

Felucca-opx

Felucca's multi-engine synth with one engine added: an altered-FM voice after the Korg opsix, with everything else unchanged.

Made by
thomasgregorymarsden-code
Released
October 19, 2026
Built on
Felucca
Install
On GitHub
Scan
Not scanned yet What we checked
Last checked
October 31, 2026

What Felucca-opx does

  • Fourteen engines cover virtual analog, FM, phase distortion, chiptune, samples, organ, granular, physical models, noise, slices and drums.
  • The OPX engine gives six operators per voice with 40 algorithms and a USER matrix, plus seven factory sounds.
  • Each operator runs as FM, ring mod, filter, filter FM, wave folder, effect, bypass or mute, with 23 waveforms.
  • Four tracks share eight voices, each with 64 steps, chords, ties, accent, slide, chance, velocity and ratchets.
  • Live loop recording, step recording, parameter locks and knob automation all land on the same steps.
  • Play the keys chromatically, in a scale on the white keys, as one-finger chords or through the arpeggiator.
  • Save sounds to 32 user preset slots and 4 projects, named on the device, with an autosave that restores your last music.

Its modes

ALGO
Set the algorithm, every operator's attack and decay, and the patch slot, with an oscilloscope beside the algorithm chart.
OPERATORS
Pick one of the six operators and step through its MODE, PITCH, EG, KTRK, USER, ALGO and VOICE rows.
HOME
Play with the track's four main knobs over an oscilloscope or the four tracks and their levels.
CLOCK
Set the tempo, swing and clock source.
STEP
Write and edit steps in the piano roll or the drum grid, and hold a step to lock parameters.
DETAIL
Set the cursor step's chance, ratchet, nudge and velocity on the four knobs, drawn as lanes.
AUTOMATION
See and edit every lock, automation event and per-step value on the track as one list.
SONG
Chain up to 16 sections, each naming the project slot every track plays and its repeats.
SEQ TOOLS
Reach CLEAR, REVERSE, SHIFT, RANDOM and COOK on the keys, with length, division, swing and gate on the knobs.

What Les checked

Felucca-opx v0.2.0Last scanned: v0.1.0, October 31, 2026

What we checked for

  • The file is exactly the one its author published
  • It's the same file we saw when this release first came out
  • It opens cleanly as an FM-1 firmware, nothing damaged
  • It doesn't show up on your computer as a keyboard, mouse or other input device
  • It doesn't show up as a USB drive or network adapter
  • Its text mentions no computer command tools, like PowerShell, Terminal or a download command

What we found

  • MIDI and audio, as expected
  • A serial port, which many FM-1 firmwares keep for debugging. It can't type into your computer.

StatusNot scanned yet

We couldn't tell which file in this release is the FM-1 one, so we didn't scan it.

Les scans every firmware here whose file is public, and shows what it checked and what it found. A scan lowers the risk; it can't rule it out. This firmware is made by its author, not by Les or M-VAVE. Back up first, and install at your own risk. How Les scans firmware

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