Changelog

Format loosely follows Keep a Changelog. This project doesn’t use version numbers yet – it’s a single dedicated appliance build, not a versioned library – so entries are grouped by date instead until that changes.

[Unreleased]

• Fixed: booting without the library USB dropped into systemd emergency mode (no SSH, unrecoverable on a headless appliance) instead of the local standby fallback. Cause: the overlay filesystem’s default recurse=1 wraps every mount (including /media/usb) in its own overlay with no nofail, so a missing USB failed a boot-critical mount. Fixed by setting recurse=0 (root only) in cmdline.txt – see systemd/README.md section 4.
• Added LIBRARY.md (en/es): how to name library USB folders/files, and the exact filename-spacing mistake (A - x.mov vs A - x.mov) that fails completely silently – found live while testing a Set 5 video that didn’t play.
• Project renamed from “Sequence Pedal” / “Pedal de Secuencias” to Chocolate Pi – a proper product name (playing on the M-VAVE Chocolate foot controller + Raspberry Pi actually used) instead of a literal description. Repo, badges, and docs updated to match; GitHub redirects the old repo URL automatically.

2026-09-05 – Initial public release

First open-source release. Actively used and validated against real hardware (Raspberry Pi 2, Behringer U-PHORIA UM2 USB audio interface, M-VAVE PD41 MIDI controller, library USB drive).

• Layered architecture (Adapter → Mapper → Core) so controller-specific code never leaks into playback logic.
• Adapter validated against an M-VAVE PD41 in Program Change A mode (see MAVAVE_ANALYSIS.md for the empirical mapping and its correction: 8 groups, not 32).
• Core: library resolution from a USB drive, mpv-driven video with a standby loop, a dedicated audio-only lane for standalone tracks, and audio always prioritized over video.
• Local fallback standby video for when the library USB isn’t present at boot.
• systemd auto-boot service; USB presence checked once at boot only (no live hot-swap – a reboot is required to pick up library changes).
• Read-only root filesystem (Raspberry Pi OS overlay) so the Pi can be power-cycled at any moment without filesystem corruption risk.
• MIT license, bilingual documentation (English primary, Spanish under docs/es/), GitHub Sponsors.