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HeyGen documents speech-to-speech conversion for instant voices
HeyGen’s current developer changelog and API guide document `heygen-voice-sts-0` converting a recording of up to 300 seconds into speech in an active instant voice. The output is WAV; professional voice clones are not supported for this endpoint. The changelog gives only an October month heading, so no exact launch day is established. Users need rights to any voice they clone.
Primary source · HeyGen
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