Teenage EngineeringOther
Unreleased stem player that doubles as an nRF52840 dev board
The SP-1 is a handheld stem player designed by Teenage Engineering that was never officially released. It has four faders, four track buttons, a speaker, a USB-C port, a TRS sync jack and an internal eMMC card that holds the song stems. Units that were built reached buyers as-is through liquidation and online resellers, and the community has since documented the board and written new firmware for its Nordic nRF52840 microcontroller.
Teenage Engineering has no product page, support or documentation for the SP-1. The bootloader can be re-entered by holding Track 1 and Track 4 while plugging in USB, and the firmware entries here flash through the browser-based Solderless utility without opening the case. Several of them state that the stock firmware cannot be restored once replaced.
Early-stage community custom firmware for the SP-1, currently a minimal Zephyr base with LED animation, a watchdog and a power-off-to-bootloader button.
by softmodded
| Version | Date |
|---|---|
| v0.0.1 | 2026-06-21 |
Turns the SP-1 into a generic four-fader, four-button MIDI controller that sends CCs over USB MIDI and the TRS sync jack, with a control table defined in one source file.
| Version | Date | Notes |
|---|---|---|
| main @ 03bc636 | 2026-08-08 | No tagged releases; this is the latest commit. |
Four-track, tape-style looper firmware for the SP-1 with sixteen songs, stereo recording, effects pages, bounce and a browser tool for transferring loops.
by chattock, marcabisamra
| Version | Date | Notes |
|---|---|---|
| v3.1.1-official | 2026-09-13 | |
| v3.0.0-official | 2026-09-07 | Stereo recording and effects; changes the storage format. |
| v2.7.2-official | 2026-08-17 | |
| v2.7.1-official | 2026-08-14 | |
| v2.7.0 | 2026-08-12 |
Semimodular synth firmware for the SP-1 that combines Mutable Instruments Plaits and Marbles with new performance, preset and USB audio and MIDI features.
by Worldwave