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open-mpk4, image 1 from its README
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Firmware

open-mpk4

Loud87/100

Open firmware for the Akai MPK mini IV: 8-track looper, harmony, arp, step edit, nine mod-wheel effects and a TE-style screen.

forAkai Professional MPK mini IV·by@giusmarci

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Download v1.0.0

openmpk4_v1.0.0_fw40.07_app_package.bin· 105 KB· +1 file

MIT· giusmarci/open-mpk4·giusmarci.github.io/open-mpk4/·downloads come from the creator’s GitHub releases

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  1. v1.0.0OPEN MPK4 v1.0.0 (firmware 40.07)Latest2 files

    v1.0.0 (firmware 40.07)

    First public release.

    • 8-track looper with patterns and song; per-track MIDI channel and output (USB, DIN, both), mute, solo, polymeter
    • Harmony: scales, 53 chord styles, chord pads coloured by function; changes heard at once on held notes
    • Nine mod-wheel effects, one per track, picked with SHIFT + wheel: GLIDE, BLOOM, RISE, SHIMMER, SWELL, SPREAD, STRUM, DENSITY, STUTTER
    • Step edit, arpeggiator, per-track MIDI effects, internal or followed clock with clock out
    • Seven screen themes and the boot animation
    • Note output rule: no stuck notes, whatever the effects do
    • Tools: app packages with no Akai bytes, fetch_stock.py, flasher with dry run and flash stock

    Firmware history before the public release: 40.01 bring-up, 40.02 first playable, 40.03 fixes, 40.04 boot animation, 40.05 live re-voice, wheel UX, timer clock, 40.06 nine-effect wheel picker, per-track effects, latch on keys, 40.07 note output rule, per-track sound, GLIDE curve.

    Install

    Follow the README: python3 tools/fetch_stock.py, then python3 tools/mpk4_flash.py flash openmpk4_v1.0.0_fw40.07_app_package.bin (dry run, must say "image OK"), then the same with --write.

    sha256 of the app package: f3c3e9abdf0c11ece220455d34df9c96453b38b1676b855c9bd417f7066d0487