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Old 11-08-2021, 08:50 AM   #4
Doitsu
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Join Date: Dec 2010
Device: Kindle PW2
There's actually a W3C draft:

EPUB 3 Text-to-Speech Enhancements 1.0

IVONA 2 Text-To-Speech has SSML support:

SSML Support in Ivona Text-To-Speech

Some Microsoft SAPI voices also have limited SSML support.

Improve synthesis with Speech Synthesis Markup Language (SSML)

However, AFAIK, there aren't any epub3 apps with SSML support.
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