Yeah ... let's just get Hype to pull a rabbit out of a hat while we're at it!
I'm joking of course but I'm not sure this would be a feasible "Feature Request" for the guys at hype to build into a future release
• alter the speed of the music and
• to loop sections
Syncing this with animation over a PDF file would be the problem I foresee. I mean you could probably create an animation that syncs with the PDF file or an image
but getting this to sync with music when the speed of the music has been changed and so on would be a problem,