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RAINBOW37, image 1 from its README
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Firmware

RAINBOW37

Rising69/100

Unofficial SMK-37 build of Rainbow mode by joshbartlettband-web (upstream PR pending)

RAINBOW37 is custom firmware for the M-VAVE SMK-37 Pro and M-VAVE SMK-37 Elite, by @genkigenki. Open source under GPL-3.0, latest release v0.2 (October 2026), 1 star on GitHub.

forM-VAVE SMK-37 Pro,M-VAVE SMK-37 Elite·by@genkigenki

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Download v0.2

rainbow37-0.2-mke.fwsc· 636 KB· +2 files

GPL-3.0· genkigenki/RAINBOW37·genkigenki.github.io/smk37/·downloads come from the creator’s GitHub releases

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93 commits and 2 releases in the last year
Activity · last 12 months
2 releases
  1. v0.2Rainbow mode SMK-37 build 0.2Latest3 files

    Rainbow mode, the music toy for kids by joshbartlettband-web (based on Felucca 1.1.5), on the M-Vave SMK-37.

    0.2: the ten outer keys (C3..E3, G#5..C6) show their note's letter too.

    Controls: SMK37.md.

    Packages: rainbow37-0.2.fwsc (SMK-37 Pro), -elite (SMK-37 Elite), -mke (MKE-P37). The easiest way to install: https://genkigenki.github.io/smk37/ (Chrome or Edge). To go back, M-Vave's own updater works directly. Experimental, at your own risk.

  2. v0.1Rainbow mode SMK-37 build 0.13 files

    Rainbow mode, the music toy for kids by joshbartlettband-web (based on Felucca 1.1.5), on the M-Vave SMK-37.

    • The 16 pads are the white keys in their note colours; they light up with FOLLOW, GUESS and CHORDS.
    • Faders: BIG/SMALL, DAY/NIGHT, ECHO, WIGGLE. Pitch wheel: a small slide. Mod wheel: more wiggle.
    • KNOB BANK: a surprise friend. FADER BANK: the next sky. < >: the friend before / after. No menus from the toy.
    • K1 volume never goes above the grown-ups' cap (PATCH held 1 s, then OCTAVE- / +). Every key plays at the same loudness.

    Controls: SMK37.md.

    Packages: rainbow37-0.1.fwsc (SMK-37 Pro), -elite (SMK-37 Elite), -mke (MKE-P37). The easiest way to install: https://genkigenki.github.io/smk37/ (Chrome or Edge). To go back, M-Vave's own updater works directly. Experimental, at your own risk.