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Calibre can't do that. Embedded media is only possible with epub 3 and calibre only converts to epub 2. Additionally there aren't many devices/readers capable of using epub 3. Maybe someone else here can give you directions in using sound files, I don't know epub 3 and its capabilities.
Only thing in epub 2 would be links to a site hosting the sound files. But thats not a satisfying solution.
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