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Ten videos on the docs site played in silence. The player is click-to-play, so a reader deliberately starts them and gets nothing — which reads as broken rather than as a stylistic choice. The music is from HeyGen's own catalogue, pulled through the media-use skill's resolve path with the account already authenticated on this machine. That matters more than convenience: the launch projects on disk carry a `launch-music-trimmed.mp3` with no licence, no attribution and no metadata, and three Pixabay tracks. Neither belongs on the official docs CDN, where objects cache immutably for a year. Mixed at roughly -22 to -24 dB mean so it sits under the picture. Getting there took two corrections worth recording: proportional fades, because a 1.2s fade-out on a 5s clip eats half the audio; and seeking 11s into the bed, because its first ten seconds are a quiet intro that dragged every short clip down to -27 dB. The three Examples tiles are left silent on purpose — they are muted autoplay loops, so an audio track would only be weight. Verified: every video referenced anywhere under docs/ that is not a muted autoplay tile now has an AAC stream, checked against the live CDN URL rather than the local file.