SP-1-knowledgebase-skill

This skill should be used when the user asks about the Teenage Engineering SP-1 stem player (or "Stem Player SP-01"), the nRF52840-based Kanye/TE collaboration device, custom firmware development for it, custom stems / album encoding, the bootloader trigger ("Track 1 + Track 4"), `solderless.engineering`, the `ericlewis/sp1-midi` Zephyr BSP, the `audiothingies` / `storagethingies` reference code, APPROTECT glitch attacks on the SP-1, eMMC extraction via test points or desolder, the 0/2/1/3 block interleaving for tape FF/RW, MIDI clock encoding in the audio data, the CS42L42 / TAS2505 / BQ24232 / CYBT-353027-02 / THGBMNG5D1LBAIL chips wired in the SP-1, or any technical question about the device's hardware, firmware, format, or reverse-engineering history.