Audio .aiff is an audio file format standard for storing sound data. Save your documents in .aiff to have the text read out to you.
Click the Voice list and select which voice should read out the text.
Voices marked with (*) must be downloaded before use.
Move the Speaking rate slider to adjust the speed.

Tip:
to have the output read out to you
directly, click the Destination tab,
select Open in application and
select a supported application.