Press space to make it say something. Arrow Keys to change voice. Press the play button to play the last recorded speech. Press the stop button to stop talking. Press record to start recording speech, and press it again to stop. (WARNING: PRESSING THE RECORD BUTTON WILL WIPE THE LAST RECORDING) Press download to get a copy-able code of the recorded speech. (selecting it in 'See Inside' is recommended) Press upload to be able to paste a code for recorded speech.
The text-to-speech feature is pretty much the only thing I like about 3.0 (sorry ST), so I decided to make a project all about it!