Les

FM-1 firmware · 1.1.0

VESPER

Sixteen ambient worship scenes, each four lush voices in a major key you choose, to play live over and record into.

Made by
Fat Cat Studios
Released
October 30, 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 VESPER does

  • Each of the 16 scenes stacks four lush voices around a key you choose, typically arp, lead, bass and swell.
  • Everything stays in a major key, so the layers always agree.
  • Press ARP to switch the keys from setting the key to playing the focused voice live.
  • REC records what you play straight into the sequence, and it works while you play.
  • One knob, SPACE, adds grains, shimmer, reverb, echo and a cleaner low end across the whole mix.
  • The global chain gives drive and bit crushing, filters and compression, a granular cloud, plate reverb and tape echo.
  • SAVE stores your work to 16 user slots alongside the factory scenes.
  • Piano, marimba and glockenspiel voices play from VESPER's own sample bank, and Bluetooth and MIDI settings live on GLO.

Its modes

HOME
Shows the crystal orbit, where the four layers turn as rings around the key you set.
Mixer
A second press of HOME gives a 4-track mixer whose faders become pan when you hold SEL.
EDIT
Five pages per voice: SOUND, TONE, OSC, VOICE and MIX for level, pan, reverb send and echo send.
ENV / LFO
Sets amp and filter envelopes plus tempo-synced filter motion, autopan and analog drift.
FX
Steps through the global chain one page per press: DIRT, TONE, TEXTURE, then VERB + DELAY.
GLO
Holds clock and MIDI settings, Bluetooth, swing, click and the THEME choice.
PRESETS
Opens the save slots, where K1 switches between USER and FACTORY.

What Les checked

VESPER vesper-2.0.1Scanned October 31, 2026

What we checked for

  • The file is exactly the one its author published
  • 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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