Local synthetic media lab

Create an audio test file

Generate a tone, sweep, seeded noise signal, or digital silence. The source is synthesized in a dedicated browser worker; no microphone, upload, account, or server-side processing is involved.

Recipe v1

Synthetic audio recipe

No upload

Output formatDuration (seconds)SignalSample rateChannelsBase frequency (Hz)Seed

Audio timeline

Schedule synthetic events, route stereo channels and control their levels. Timeline layers replace the single signal. Overlapping gains must total at most 1 per channel.

Cue points

Cues export with exact times and sample-frame positions in a companion JSON file.

Capability

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Reproducibility: byte-identical. The recipe and pinned encoder path determine the expected output tier.

What the hashes prove

PCM and pinned WASM paths are expected to be byte-identical for the same recipe version. Ogg/Vorbis and Opus use a browser codec when available and promise content equivalence, not cross-machine byte identity. Encoder licensing and codec notes are published in the documentation.