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GRIMM, image 1 from its README
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Firmware

GRIMM

Hype48/100

Four-track firmware for dark ambient and dungeon synth styles.

forM-VAVE FM-1·by@GRiMMBIENT

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Download v1.0

grimm.fwsc· 596 KB· +3 files

GPL-3.0· GRiMMBIENT/grimm·grimmbient.github.io/grimm/·downloads come from the creator’s GitHub releases

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  1. v1.0GR!MM 1.0Latest4 files

    GR!MM 1.0, the first public release: a dark ambient, dungeon synth and deathdream firmware for the M-VAVE FM-1.

    Install: pick GR!MM on the FM-1 Firmware Hub in Chrome or Edge, or download grimm.fwsc below and install it with py tools\fm1_install.py grimm.fwsc. Installing firmware is at your own risk; the hub's Rescue page brings a stuck FM-1 back.

    Try it first: the demo runs the same firmware in your browser. The editor edits sounds live on the FM-1, loads samples and makes backups.

    What's in it:

    • Four tracks with six shared voices and seven sound sources: VA, 6-operator FM (fully editable on the FM-1), SAMPLE, VOICE, WHEEL, PHYS and PHASE
    • 40 factory sounds and 64 slots for your own, with names
    • Four factory samples (URCHIN, LEAVE, NIKOLAI, M-SOFT; CC0), written into empty sample slots at the first start. RESTORE FACTORY SAMPLES is on SYSTEM 2 and in the editor
    • Effects: TAPE, GRAIN with FREEZE, DELAY, and SPACE (reverb up to ~32 s, and infinite)
    • Per track: envelope, LFO, filter, scales, one-key chords, arpeggiator, latch
    • A 64-step sequencer per track with chance, ratchets, note lengths, step locks and pattern tools
    • Song mode, slots A–D, a performance layer (freeze, throws, tape stop, reverse, filter sweeps, stutter)
    • MIDI in and out, MIDI learn, USB audio, autosave, the battery level on HOME

    The manual explains every page and combo.

    Package identity: FM-1_966. Your sounds, slots, settings and samples are kept when you update.

    Free software under GPL-3.0; LICENSE, LICENSING.md and LICENSES.zip are attached. Built on Dinghy (zvenson), Felucca (Leo Kuroshita, Hügelton Instruments) and SLOOP (isod89).