my suggestion if you need to time the piece to a song is to render in poser and then piece together in a movie making program.  For me at least I have found a lot more freedom in the timing that way.  Timing in poser afaik sucks.  Either way you are going to be rendering 1440 frames so - might as well take the easier approach with the timing.

For my animations I also hate rendering in poser.  Maybe it will be easier for you but personally I LOVE to render poser scenes in Carrara and if time is a factor rendering 1440 scenes will certainly be faster in carrara.

Those are my 2c on your project.  Good luck it should be a long fun journey for you.

I am:  aka Velocity3d