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feat(audio): Music becomes a crossfading playlist of 5 mellow synth tracks

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Replace the single ethereal loop with the operator's chosen set — Music for
Manatees, Dewdrop Fantasy, Eastminster, Overheat, Concentration (Kevin MacLeod,
CC BY 4.0, drumless). The Music source now plays one track and every 5 min
crossfades to a random OTHER track (pure HEFScrub.pickNextIndex, never an
immediate repeat), altitude-independent, reusing the two audio elements; both
primed in-gesture for Safari. Intervals injectable via window.__hefMusicRotateMs
/ __hefMusicXfadeMs.

Media loudness-normalized + transcoded under the 25MB LFS limit (build_audio_media
MUSIC), committed via LFS; ethereal loop retired. CC-BY attribution added to
credits.html. Docs updated (music-candidate-pool = final set; audio-candidate-pool
ethereal section superseded).

+2 node unit (pickNextIndex), +2 e2e (music-playlist), audio-source spec updated.
40 unit + 49 e2e green; live probe confirms playback + rotation.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
BenStullsBets
2026-07-02 16:22:28 -07:00
parent 969236b3f7
commit 4f4f21a767
16 changed files with 246 additions and 56 deletions
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docs/audio-candidate-pool.md
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@@ -50,7 +50,13 @@ recordings (NASA/NOAA) keep the "machines reshaping perception" thesis literal.
| 🏖 coast | `coast/waves` | Sea waves + tern calls | BigSoundBank #0267 — https://bigsoundbank.com/sea-waves-and-seagulls-s0267.html (`/UPLOAD/mp3/0267.mp3`) | 57s | CC0 |
| 🕳 abyss | `abyss/whale` | NE Pacific blue-whale "AB call" | NOAA PMEL — https://www.pmel.noaa.gov/acoustics/multimedia/NETS_bluWhale.wav | 13s | PD (NOAA) |
## Music (the Audio-dropdown "Music" option, shipped 2026-07-01)
## Music (the Audio-dropdown "Music" option)
> **SUPERSEDED 2026-07-02:** the single ethereal loop below was replaced by a
> **rotating crossfading playlist of mellow drumless synth** (Kevin MacLeod, CC BY) —
> see `docs/music-candidate-pool.md`. The ethereal-loop record is kept for history.
### (history) ethereal loop — shipped 2026-07-01, then replaced
**One** ethereal ambient loop, played the same at every altitude (altitude-independent —
NOT the per-altitude idea the "cosmos/music" / "Frozen Star" rows above reserved; those