[pidgeon92]

I think it's a feature, not a bug. Basic Web is the only thing that is available until you add MP3s

Once you load some MP3s, it appears that Play MP3s will be available as a choice.

Text to Speech is available from within a book, not from the Experimental menu, so while the feature is described there, you will not be able to access it from there.

 

[pidgeon92]

Yep, after you turn on text to speech, you can change the options by clicking on the font key, and choosing each option with the controller.