How do I fade the music between slides?

I'm adding music to my presentation, but I don't want the same song playing the entire presentation. As the Learner transitions among the slides, I'd like the music on the previous slide to fade out, before going to the next slide. I see how to change the volume in Audio Editor, but it's an abrupt change. How do I fade the music in and out?

Thanks so much,

- Marilyn