i had problems with it.
it seemed to lock up often.
it was really made for it's own tts software only.
after using many, many voices... i decided to make my own.
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i have used many sapi4 and sapi5 voices though, and studied each one quite a bit.
if you need a recommendation for something particular, just ask.
the emotional thing though, is not to be found in any other voice that i have used.....with the exception of "monotone" and "whisper"...or Cepstral's voices that are "calm" or "child" or "shout" ect.