espeak is a fast speech synthesizer and is the only open source synthesizer I know that's still understandable when played at high speed (300-400 words per minute).

And this is the only python library that wraps the C library `speak_lib` rather than calling the `espeak` binary. This wrapping is needed to get callbacks from espeak. The espeak C library `speak_lib` has even more features that I wanted so I added them to this wrapper.

What do I need these features for? That's being prepared for next week.