Very cool but...
I can stop the audio in the browsers I tried. I suspect it is either (a) how your browser deals with the HTML5 <audio> tag or (b) how I am currently positioning the audio player on the screen. Since Wayne wants the user to have the ability to skip around, I was thinking of not displaying the audio player (and thereby hiding some cross-browser differences, solving another problem) and simply having a start/stop button.
Yes, text can go over pictures as in my Milford Road slide. The slide div must have the fill class, as in:
<div class="slide fill">
I don't yet have a fancy way of defining the text color or background.