What is it?

Translations should capture the nuances of human expression. While existing translation tools are skilled at capturing the content within a conversation, they typically rely on monotone, robotic text-to-speech systems for their output. SeamlessExpressive aims to preserve intricacies of speech; such as pauses and speech rate, in addition to vocal style and emotional tone.

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You can read the original article from the Meta website by clicking on the image below. There are videos and a lot more details there.