- audio::AudioScrub: an open output that plays a faded snippet (one frame, 30–100 ms) of the
comp's mix at each new frame, replacing what is still queued; holding still repeats nothing.
The mixing is shared with the preview feeder (mix_block); AudioFeed::clear.
- The Timeline ruler: Ctrl/Cmd-drag scrubs audio (EffectcraftApp::scrub_audio opens the output
through the audio device hook on first use). The Audio panel meters follow the snippets; an
idle second closes the output.
- playback.scrubAudio {time?} for agents.
- Tests: ui_audio_scrub (snippet length, fades, same-frame no-op, replace not pile up, silent
comps, Cmd-drag in the ruler, idle close) with a fake device. Docs: parity.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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