Les

FM-1 firmware · 0.2.3

Unholy Union

Generative ambient and drone: it rolls a pad, a sequence and a chord arpeggio in one key, leaving a fourth voice for your hands.

Made by
actuallysparky
Released
October 13, 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 Unholy Union does

  • Immaculate Permutation builds a four track ambient project in one key: pad, sequence, chord arpeggio and an empty track for you.
  • Thirteen engines cover ANALOG, FM6, PHASE, LOFI, SAMPLE, VOICE, TRIO, WHEEL, GRAIN, PHYS, NOISE, SLICE and DRUM.
  • The DRONE page latches a played chord with HOLD, then moves it with EVOL, TENS and a bar-length RAMP.
  • Hold ENV and press OCT+ to evolve the harmony, or LFO and OCT+ to add slow modulation across all four tracks.
  • AUTO EVOLVE under SYSTEM shifts the harmony every 2, 4, 8, 12, 16, 24 or 32 bars while PLAY runs.
  • Hold SAVE for just over a second to keep the current project as SERMON A to D, and hold OCT- to undo the last rite.
  • The Choir Loft editor and the Altar of Four Winds macro desk connect over USB for editing, live macro moves, project export and Ark backups.
  • The instrument plays through its speaker or analog output, and records into a computer over USB in stereo.

Its modes

HOME
See the selected track and browse sounds with PRESETS, then tap on to MIXER and CLOCK.
ARP
Set the arpeggiator mode and its hold behaviour for the selected track.
DRONE
Set HOLD, EVOL, TENS and RAMP to latch chords and give them slow movement.
ENV
Shape the amplitude envelope and pick where the envelope is sent.
LFO
Dial two LFOs and choose their destinations for the current track.
MOD
Route four modulation slots, picking a source, a destination and an amount.
MACRO
Set the four song-wide macro values MAC1 to MAC4 with the knobs.
SCL
Choose root, scale, quantization and transpose, then step on to CHORD.
IMMACULATE PERMUTATION
Choose KEY, SCALE, RITE and STIR, then press OCT+ to reveal a fresh ambient project.

What Les checked

Unholy Union v0.2.3Scanned 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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