I was noticing that special characters where read as 'xx'. I discovered that festival can't read utf8 special characters correctly, so I solved it by changing the TextToSpeech_unix.cpp file to send the output encoded in ISO-8859-1(Latin1) instead of UTF8 and it works fine. So I was wondering if you could change it, or at least make it configurable some way.
I actually thought festival was supposed to grok utf8, but I guess I was wrong :(
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