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The Firmware Hub · FM-1 · Kitten Rack

Kitten Rack for the M-VAVE FM-1

Kitten Rack1.4.0

by Black Kitten Devices GitHub ↗

synth

A Eurorack-style modular synth: 56 modules (VCOs, a Moog-style ladder, a Moog 960-style sequencer that plays your voices, a low pass gate, Turing, Marbles, chaos, effects) patched with cables on the FM-1 itself, a 64-step sequencer with live recording, 33 factory patches, visuals, USB audio and…

Text by the maker.

About it

Engines
Analog / VAWavetablePhysical modelling
Its own: VCO · VCO WT · VCO CZ · Noise · String (Karplus) · Resonator (modal)
Runs on
FM-1 · Browser ↗
Release
1.4.0 · released 10 Nov 2026 · on the hub since 2 Nov 2026596 KB · what's new
Licence
GPL-3.0 · source ↗ · copy on the hub
Flash chip
The first FM-1s onlyOn a newer FM-1 (flash 0xB36014) this version keeps your saves in RAM only, and updates from it may fail: what to do
Identity
FM-1_79140what it reports over USB while it runs
Build
Built by its maker, not signed
Popular
↓ 27 installs via the hub · ★ 8 on GitHub

Family

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Changelog

What changed, version by version6 versions

1.4.0 — 2026-11-10

(Tested on the FM-1 as 1.4.0-rc1.)

  • Seq 960, after Moog's 960 sequential controller: three rows of eight steps (A, B, C, 1 / 2 / 4 octaves each), a stage switch per step (PLAY / SKIP / STOP / RESET), the transport or a clock in CLK, RESET and HOLD inputs, outputs A, B, C, GATE, T1..T8 and KEYS: the notes of row A, B or C (KROW) into a voice or a Drum map without the FM-1's keys, velocity fixed or from a row (VEL). Patch format 50 (only patches that use it).

1.3.0 — 2026-11-01

  • A button stays lit while what it opened shows (SEQ, SAVE, EDIT, HOME, FX, LFO, ENV, GLO); the keys light while held or played by the sequencer (MENU > PANEL > KEY LIGHTS turns that off).
  • The repository's front page: what Kitten Rack is, screenshots, a quick guide; the full manual moved to docs/MANUAL.md and docs/MANUAL.es.md.

1.2.0 — 2026-11-01

  • Live takes as played: QUANTIZE OFF keeps each note's timing within its step and where it was let go; fix it on SEQ (step held + ALGO) or quantize the pattern (SEQ held + OCT−).
  • REC as on SLOOP: the REC window (MODE GRID / FREE, LENGTH 1/2/4 bars, START on a note or after a count-in, QUANTIZE), free takes whose tempo follows you, MENU > REC.
  • A click (OFF / REC / ON, never in the USB audio), PLAY's light on the beat, undo (REC + OCT−), tap tempo (PLAY held + REC), REC held 4 s clears the pattern on any screen.

1.1.0 — 2026-10-30

  • PRESET onto a patch with no sequence keeps the one playing, to try sounds over it.
  • MIDI LEARN in the editor; the map is stored in the patch and works on the FM-1 over USB or TRS.
  • The name is written Kitten Rack.

1.0.0 — 2026-10-29

  • First full release: identity FM-1_79100, the ENGLISH / ESPANOL screen setting, the browser player, the big-screen visuals.

0.1 – 0.5 — 2026-10-29

  • Test versions: the rack on the FM-1, patching on the device, the Muug filter, the factory bank, the visuals, the installer.

CHANGELOG.md on GitHub ↗