A helpful YouTube video about choosing an aggregator/distributor (the part about VoicesShare is outdated and no longer available)
ACX
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ACX Audio Submission Requirements
Author’s Republic
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Author’s Republic Audio Submission Requirements
Findaway Voices
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Findaway Voices Blog Audio Mastering Guide and Audio Submission Requirements
Daydreamer Productions Resources
Daydreamer Productions Narration Changes and Corrections Form (Click to download editable Word docx)