At the gig last night, one of the sponsors was telling me about another dance they did recently. He called it a "silent disco". It was a headphone event, 300 guests and he said each headphone had 3 separate audio feeds. He said it was hysterical, watching all those kids, dancing to different songs and singing all these different songs to the top of their lungs. I just couldn't imagine trying to keep up with 300 sets of battery-operated phones. Have any of you guys looked into this type of setup?