Mixing Voice and Music Fast in Final Cut Pro

Have you ever had a producer tell you to cut a few shots out of your video after you already made the "perfect" mix using clip overlays, keyframes, and rubberbands? Here is an old school technique I use that prevents this frustration. It keeps audio very flexible with the use of through-edits, crossfades, and the roll tool. Check it out and be happy!

Also, if you have other time saving mixing techniques I'd love to hear 'em.