It uses the IBM Speechworks ETI-Eloquence software for text to speach. But i should think it would be nothing to sync up the wave file from AT&Ts if you prefer another text to speach engine. I know in soundforge it wouldn't take long to be sure that the timing was the same. info@puppetsoft.com They are very responsive with their email support. I'd give them an email to see if they have tried it out on Macs with an emulator.