Waller uses a piece of software called VocalWriter (which allows you to combine text and midi files to create sung lyrics) for the Mac. However, the Mac's "Text to Speech" function does not create sound files (you'd have to record the speech externally, and then rerecord it on hard disk). While Quicktime will translate midi files into AIFF files, and SimpleText will read text aloud, and allow you to include sound files into a SimpleText document--they still have no method to transfer text to AIFF, WAV or MP3.