This is borderline off-topic, so I'm going to play it safe and post it in the off-topic section. The Admins/Mods can move it to general if they feel that it's too on-topic.
My question is, how did they do it? In the main part, they give a presentation via wireless headphones. However, it's the first time I've ever thought that the audio was coming from somewhere other than the headphones.
If any of you are planning on visiting Disneyland, I would suggest checking out the Great Moments with Lincoln exhibit, since it IS very impressive (at least from an audio perspective).