Synthesising the soundtrack

So you've been prompt-injected (1989)

A deadpan 1989 training tape about a 2026 problem: a memo with a hidden line talks the office computer into faxing the payroll. Rewind the tape and the hidden line glows hot.

Composite video emulated in WebGL2: each frame goes from RGB to YIQ, onto a 3.58 MHz subcarrier and back through a notch filter, so colour bleeds and dots crawl
VHS faults in the same signal path: tape noise, chroma delay, head-switching skew, dropouts, tracking bars and a rewind that tears the picture
FM synthesis soundtrack (electric piano, bell lead, slap bass, gated-reverb snare) rendered in an OfflineAudioContext, then run through wow, flutter and hiss
Record to tape: WebCodecs encodes every frame and the soundtrack, and Mediabunny muxes them into an MP4 or WebM file in the page

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Saves the whole tape, picture and sound, as a video file.