5 Replies
Chris Seger

I've used a Media Semantics product called Character Builder.  It comes with a few Neospeech voices and several others as well. It's not the greatest, but can get the job done and in multiple languages and gives your course an avatar (if you're into that kind of build).  You can adjust length of pauses and tweak some of the phonetics within the program, but it's far from perfect.  At the end of the day most any TTS programs will end up sounding somewhat robotic, but it might be an option for you.  Good luck!