Les

FM-1 firmware · 3.0

Tessera

Generative music on four tracks: each plays steps, an arpeggio or one of 13 generators, and the tracks evolve, follow and modulate each other.

Made by
Theo Dainis (Rastapopolix)
Released
October 30, 2026
Install
On the FM-1 Firmware Hub · source on GitHub
Scan
Not scanned yet What we checked
Last checked
October 31, 2026

What Tessera does

  • Each of the four tracks plays its own steps, an arpeggio, or one of thirteen generators.
  • The generators include TURING, EUCLID, MARKOV, MORPH, ATLAS, BOUNCE, AWAKE, POLY, QUAD, CONSTL, SERIES, CHORD and ANSWER.
  • Four engines sit on the device: six-operator FM6, the two-oscillator ORACLE, three-oscillator TRIO and DRUM with 808 and 909 kits.
  • The step sequencer gives you per step ratchets, nudges, conditions and a pitch accumulator that climbs each pass.
  • Hold REC on a generator track to print its last bars into ordinary steps you can edit.
  • One key and scale cover the project, and a CHORD track plays a progression the other tracks snap to with QNT CHRD.
  • A project saves everything in one slot: patterns, sounds, seeds, sections, energy and cords.

Its modes

GEN
KNOB 1 picks the track's MODE: STEP, ARP or one of thirteen generators, with three generator settings beside it.
EVOLVE
Mutates a generator's phrase every few bars, or varies steps you wrote as they play, with LOCK, EVERY, AMOUNT and the ROLL seed.
FORM
Strings mutated phrases into sections A, B and C in orders such as AABA, with contrast and a flourish.
TWEAK
Transposes, drops hits, humanises velocity and length, or follows another track's pitch.
TWEAK 2
Branches hits onto another track's sound, combines tracks with logic, and plays only on certain bars.
LENGTH
Sets how long a generator holds its notes: the step's gate, a fixed length, or until the next hit.
TIMING
Ratchets a step up to eight times in even, accelerating or decelerating hits, and plays each step a little late.
ENERGY
Shapes the whole project over minutes with a slow tide, rests and a level you set by hand.
MODS
Patches up to sixteen cords from any source on any track to any destination.
MATRIX
Shows the cords as a four by four grid of source track against destination track.

What Les checked

Tessera

StatusNot scanned yet

Les hasn't scanned this firmware yet.

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.