SP-1 Stem Player

A semimodular synth for the SP-1 stem player, combining code from Mutable Instruments' Plaits, Marbles and Yarns. The a…

Turns the SP-1 stem player into a hands-on tape-style looper. Feed in audio over USB-C, record four loop tracks per son…

Experimental two-deck firmware that mixes eight stems from two songs, with a browser companion; tempo following still h…

Reusable UAC2 code and a demo firmware that let custom SP-1 firmware stream class-compliant 48 kHz USB audio to a compu…

Four-fader MIDI controller firmware.

The hub: GPIO pinout, bootloader protocol, eMMC notes, and a dev wiki for writing firmware.

Flash firmware and manage stems over USB.

Actively released community firmware, loaded with its rome CLI, continuing softmodded's original; still work in progres…

Native Mac app that converts songs or four-stem folders into SP-1 WAVs and uploads them over USB-C, no Terminal or Pyth…

CLI tool to encode and merge Demucs stems into an SP-1-compatible WAV.

An early custom firmware for the SP-1 stem player. By its own description it's in the very early stages, so for now it'…

Zephyr BSP/template that is the foundation for building custom SP-1 synths, MIDI controllers, or firmware.

Cited, curated SP-1 technical reference library packaged as a Claude agent skill.

Renode-based SP-1 emulator that tests firmware with zero brick risk before flashing.

PyUSB scripts that fuzz the Stem Player's USB vendor requests, DFU entry, and memory.

Desktop app to manage the SP-1, including a host-side Python firmware flasher.