Waveform Audiogram
A silent audiogram for the muted feed: a waveform or mirrored equalizer pulses to a scripted amplitude envelope in a framed clip — cover art and title up top, captions landing one phrase at a time, a progress rail tracking the playhead.
How it works
Author the envelope + captions in sheet.json
build.mjs validates and assembles the page
render.mjs produces a silent mp4 + report.json