Les

FM-1 firmware · 1.1.1

FM1-GM

A General MIDI sound module and 16-track sequencer with all 128 GM sounds, a GM drum kit, 64 song slots and a web song editor.

Made by
jartificer
Released
October 28, 2026
Install
On the FM-1 Firmware Hub · source on GitHub
Scan
Scanned, nothing harmful found · Oct 31 What we checked
Last checked
October 31, 2026

What FM1-GM does

  • You get the full General MIDI sound set of 128 sampled programs plus a drum kit.
  • Record in real time with overdub, quantize and count-in, or step record notes and chords one step at a time.
  • Undo, mute, solo and a one-second hold on ARP to erase a track keep takes under control.
  • Bar editing lets you change note lengths, move notes, loop a bar, delete a step and copy, paste or clear bars.
  • Songs save to 64 slots sharing the free data flash, roughly 100,000 notes, with a save that never loses the old version.
  • MIDI in over USB or the TRS jack plays the sounds, either into the selected track or as a multitimbral module.
  • A browser editor and emulator play your songs with the same engine and write them straight to a slot over USB.

Its modes

Song
See all 16 tracks and set tempo, bars, quantize and click with the knobs.
Bar
Edit one bar of the selected track step by step, changing note lengths, looping, copying, pasting or clearing.
Track
View the selected track's piano roll and set its family, program, volume, pan, channel, reverb, transpose and velocity.
Mix
Work across 16 strips and set the volumes of the selected track's group of four.
Songs
Browse the 64 song slots, load, save, delete a slot or start a new song.
Setup
Choose MIDI in mode, MIDI out, clock out, count-in, voices, click volume, lights and colours.
MOVE
Hold SEL in the Bar view to shift a step's notes in pitch or position within the bar.

What Les checked

FM1-GM v1.1.1Scanned 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

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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