Audio Files and Previews in Velveteen
Updated June 12, 2026
Every distributed track needs an audio file, a valid duration, and preview settings. Velveteen checks that audio exists, that duration is at least 30 seconds, and that the preview window fits inside the track.
The audio file is the recording stores receive. Preview settings tell downstream surfaces which part of the track to expose as a sample.
Audio checks
Audio file
The track needs audio_url before submission.
Duration
If duration is known, Velveteen requires at least 30 seconds.
Preview start
The time where the preview begins.
Preview length
The preview duration. Start plus length must not exceed total duration.
When audio locks
Once a release is submitted, Velveteen locks the linked tracks.
That lock protects the submitted delivery package from changing after review starts.
Frequently asked questions
Can I submit without audio?+
No. The release submission check requires audio_url for every linked track.
What is the minimum duration?+
If duration is present, Velveteen requires at least 30 seconds.
Are preview fields required?+
Yes. Preview start and preview length are required before submission.
Can I change audio after submission?+
Linked tracks lock at submission, so treat submitted audio as final unless support reopens the path.
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