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FM-1 firmware · v0.1.0-beta.18

TheReFmB1rth

An acid groovebox of four machines: two 303-style bass synths and synthesized 808 and 909 drum machines, with patterns and song chaining.

Made by
Alexander Seel
Released
October 16, 2026
Install
On GitHub
Scan
Scanned, nothing harmful found · Oct 31 What we checked
Last checked
October 31, 2026

What TheReFmB1rth does

  • Four machines run together: two independent 303-inspired acid synths plus separate 808 and 909 drum machines.
  • On an ACID page K1 sets Cutoff, K2 Resonance, K3 Env Mod and K4 Decay.
  • The ACID step editor gives sixteen steps chosen with PRESET, each with pitch, rest, note or tie, accent, slide and probability.
  • Musical keys write and audition true chromatic pitches, and OCT- and OCT+ shift the keyboard register.
  • Drum programming picks a lane with K1 or the octave keys and cycles each step through OFF, HIT and ACCENT.
  • The 909 adds a FLAM toggle on K3 with flam width on K4, and the flam state is kept.
  • Patterns A to H chain into songs, and a four-track mixer feeds PCF, Delay, Dist and Comp.
  • USB and TRS MIDI plus USB audio connect it, and a browser editor drives the same engine fields.

Its modes

ENV
Play and edit ACID A, the first 303-inspired mono synth.
LFO
Play and edit ACID B, the second 303-inspired mono synth.
SEQ
Write ACID steps with pitch, rest/note/tie, accent, slide and probability.
ARP
Program the 808 and 909 drum machines lane by lane.
GLO
Balance the four tracks on the mixer.
FX
Set the PCF, Delay, Dist and Comp performance effects.
SCL
Pick patterns A to H and chain them into a song.
SAVE
Handle the project.
PLAY
Run the transport.

What Les checked

TheReFmB1rth v0.1.0-beta.18Scanned 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.

StatusScanned, nothing harmful found

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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