I hope the speech inflection tools are good here, and I hope this program compensates for the problems with Cepstral voices. I was a bit disappointed to see the application is based on Cepstral technology.

Why I don't like Cepstral: Test the voices and compare their inflections versus Apple's MacInTalk/PlainTalk/Speech voices. The Cepstral voices are a bit brain dead when it comes to question marks versus periods versus exclamation marks. You'd send a real person to the psychiatrist for not comprehending the difference. Example?

I heard your house is on fire.
I heard your house is on fire?
I heard your house is on fire!

Apple's voices know the difference. Not an iota of difference in inflection with Cepstral voices. BAD. Not acceptable IMHO, which is why I avoid them.