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Per Rames: add the engine audio mixer (audioMixer.ts:350 -> ffmpeg -ss) to the media-start-only readers — it's the live path that makes a lone data-playback-start a shipped output bug (trimmed picture over untrimmed audio). 'Set one' isn't enough; give the element-kind rule: <video>/<audio> use data-media-start, nested composition uses data-playback-start (Studio writes it; it's the child-timeline offset). Also fix editing-existing-videos.mdx, which offered both names as interchangeable for front trim of a clip — the exact kind where they aren't.