I know it does sound like a lot of work and I've not been able to find any
easy way to get the beats and the rythms to be precisely choreographed with
the show. In the slide sorter view, you can highlight all the slides and
attach a slide transition timing to them all at the same time. If for
instance every 5 seconds you need to transition to another slide than that
route might work for you. But I've done a lot of timing programs and
although it's a lot of work, it actually can be quite accurate.
Rich