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open404, image 1 from its README
Firmware

open404

Hype15/100

An open-source, cross-platform Go library, toolkit, and CLI for the **Roland SP-404MKII** creative sampler and effector.

open404 is custom firmware for the Roland SP-404MKII, by @iare-digital. Open source under MIT, latest release v0.1.1 (September 2026).

forRoland SP-404MKII·by@iare-digital

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Download v0.1.1

open404-darwin-arm64.tar.gz· 4.4 MB· +7 files

MIT· iare-digital/open404·downloads come from the creator’s GitHub releases

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