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Sound for the experience, plus the design to control it. Soundtrack layer (ambience), all license-clean (PD/CC0), recorded in docs/audio-candidate-pool.md (media gitignored; re-sourceable): - cosmos: Pillars of Creation sonification (NASA, PD) - orbit: station room-tone hum (CC0) - coast: sea waves + terns (CC0) - reef: 6-layer NOAA soundscape + CC0 submerged bed (PD + CC0) - abyss: blue-whale moan (NOAA, PD) Solution Design (proposed): split the bundled Content selector into two orthogonal dials, Visual (on/off) x Audio (off/soundtrack/white-noise), unlocking white-noise+video. Soundtrack follows the single Altitude dial; white noise is altitude-independent. Reframes the networked-control-surface spec SS3/SS5 (still proposed/unbuilt -> clean pre-impl edit). Music layer deferred. Dev panel: links to the clip + audio review galleries; sticky stage/panel layout. gitignore: audio media, review_audio.html, .DS_Store. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>