When I preview (F12) my video ina browser I get double text to speech playback, as if it is echoing. I don't get the same results when I preview the individual slide. Why would this happen?
I've hardy ever used Text-to-Speech, or I would try and answer. You may want to post on the actual Captivate forum that gets more use: http://forums.adobe.com/community/adobe_captivate
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