Les

FM-1 firmware · v0.26.19

Crepuscular_Homunculus

A dark synth and four-track groovebox for pads, heavy bass, metallic textures and synthesized drums, with songs saved on the FM-1.

Made by
TERKINSTEIN
Released
October 27, 2026
Install
On GitHub
Scan
Not scanned yet What we checked
Last checked
October 31, 2026

What Crepuscular_Homunculus does

  • Sixty-four factory sounds cover dark pads, metallic textures, synthesized drum kits and six-operator FM.
  • Four tracks named DRUM, MELODY, ATMOS and BASS each hold their own captured sound.
  • Every track has four A-D banks of up to 64 steps, switchable to 16 or 32.
  • Build patterns with step entry, live recording or the piano roll, where you set each note's length and velocity.
  • The four knobs shape the sound, with BODY, WIRE, DECAY and BITE on kits.
  • Set BPM, swing from straight to shuffled, and Ghost Mask, with an arpeggiator and a metronome click.
  • Press SAVE to store the whole four-track song, all sixteen banks, captured sounds and settings.
  • Play the FM-1 keys or an external MIDI keyboard with pedal support, sharing eight voices and up to four FM voices.

Its modes

HOME
Play the LIVE sound with its animation and four performance macros on the knobs.
SOUND EDIT
Shape the current sound with labeled controls like SHADE, FRACTURE, DRIFT and BLOOM, or BODY, WIRE, DECAY and BITE for kits.
SEQ
Pick a track with SELECT and its A-D bank with ALGORITHM, and set BPM, length, swing and Ghost Mask.
TRACK SOUND
Choose the captured sound for the selected track independently of LIVE.
SEQ EDIT
Enter steps with the selected track's captured sound, moving the cursor with Knob 3.
ARRANGEMENT
Reach the arrangement note editing path by holding SEL from the sequencer.
STEP EDIT
Edit arrangement notes before stepping into the piano roll.
PIANO ROLL
Move a step and pitch cursor to add or delete notes and set their length and velocity.
METRONOME
Set click BPM, level, beats per measure and beat unit, and switch the click on or off.
CONTROL FEEL
Choose LINEAR or ACCEL encoder response and the HOMUNCULUS or THORN RIFT display.

What Les checked

Crepuscular_Homunculus v0.26.19Last scanned: v0.22.0-dev, 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

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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