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Sorry to rain on your parade...
but I've just been to your site and have seen your English-German demo. I must say it's rather disappointing - and I should know, I am German.
The problem seems to be that it doesn't recognize the end of a sentence if you don't dictate a period. Here it only ruins the intonation making it rather misleading, potentially it could ruin a whole translation.
The speech synthesizer isn't great - and don't get me started on your Flash homepage.
 
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