I could do a poor job explaining it, or you could click on the link above where they'll explain it very well. It was playing at The Long Center, and the first book has toured at least 30 cities. It was fabulous, and if it comes to a town near you, you should jump at the chance to see it.
Extra pictures I took during intermission:
Sound effects table, and giant screen.
Microphone stands, where the voice actors would be.