There is a tools called Repeat After Me there which allow you to tune the voice tone and export it to AIFF. For instance, you can type in some text, and record your voice saying the same thing. Then it will sync the computer's voice to your tone in few steps. It can be handy for some of you!
[robg adds: I'd never tried this app before, and it takes a bit of work to figure out what it does -- view the PDF file in its folder for some basic assistance.]

