Looks like a lot of people are interested in this, but no one has any answers. From my own investigation I'm pretty sure that Apple's implementation of SMIL is very limited. I can't get any timing elements other than clipBegin and clipEnd to work on the audio, and looking at the EPUB3 spec no others are mentioned. I conclude from this that it isn't possible to pause the audio halfway through a page, and restart on a button click using only the SMIL file. If anyone has any further clues please speak up!
Last edited by chrxr; 11-29-2011 at 11:45 AM.