Maps every sound the pop tracks use, not just the custom synths: - bin/render-sound-samples.mjs renders the 12-voice AC percussion kit (percussion.mjs via makeBufferSynth) + four beds (sinebells, sacred-drone, cool-sine, noise-sweep) to demos/samples/. - manifest.json gains a `sounds` map — synths / percussion / beds / sourced CC0 samples — the sourced samples pointing at the committed lane assets. - the dashboard is now picker-driven: a track <select> feeds the shared player; a category→sound two-step picker drives the sound inventory. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>