Les

FM-1 firmware · v0.4.0-beta

fm1-glider

A drone instrument: white keys latch tones on and off, black keys glide them along the scale like a steel guitar.

Made by
ttreu (subcity)
Released
October 29, 2026
Install
On GitHub
Scan
Not scanned yet What we checked
Last checked
October 31, 2026

What fm1-glider does

  • Press a white key to latch a scale tone on, press again to switch it off, up to sixteen at once.
  • Black keys glide the tone beside them by one to four scale steps, one click up, a double click down, the next click home.
  • Two oscillators give warm voices with overtones, undertones, FLOAT motion, detune LFO and an interval voice that follows the key or stays pure.
  • Twenty-two presets, twenty-five scales including chord scales, and equal or just tuning keep everything in key.
  • Tape echo, ladder filter, delay and shimmer reverb sit after the voices, with tempo sync and tap tempo.
  • Tap SEQ for a drum track of twenty-seven synthesized slots, sixteen steps each, with probability, ratchets, scatter and a COLOR knob.
  • ARP rolls a completely new random beat, and PLAY starts and stops the drums.
  • MIDI over USB, BLE and DIN plays the keyboard and drums, and MIDI clock sets the tempo.

Its modes

Tones
The default mode where white keys latch scale tones on and off and black keys glide them.
Play page
Set glide time, glide steps, tone and overtones for the latched drones.
SOUND 1-5
Shape wave, detune, oscillator 2, sub, drift, width, overtones, undertones, float and the interval voice.
ENV
Set attack, decay, sustain and release for the tones.
LFO
Set vibrato rate, depth, delay and level.
SEL
Choose key, scale, equal or just tuning and the glide curve.
FX
Six pages for filter, tape echo, delay, shimmer reverb, tempo with sync and CPU load, and colour.
Drums
Play and edit the microsound drum track while the tones keep sounding.

What Les checked

fm1-glider v0.4.0-beta

StatusNot scanned yet

Its file didn't open cleanly as an FM-1 firmware, so we didn't scan it further.

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

Invite-only for now

Ask Les about your own setup

Say what you want to make and what else you use. Les gives you steps for your own gear, one at a time, and says why each one works.

To get an invite: leave your email, then join the Les Discord.

Gear named here gets added to Les first.

We'll email your invite, plus an occasional note on what's new in Les. Unsubscribe anytime. Privacy

Les is independent and not affiliated with M-VAVE or the firmware authors. M-VAVE and FM-1 are trademarks of their owners.