NVE slide show audio problem

I’m a newbie and am having a problem making my slide show DVD. I have the limit of photos in each chapter and when I add my music, they won’t fit the show. I keep adding more music but no matter how much I do, the slide show just gets longer, with the same photos at the end and no music. I can’t adjust the photo view any less than 1 minute and the transitions .10s.