[LAU] interactive performance

Hi I just brainstormed with a friend and came up with the idea of integrating the audience in my chuck based electronica performance. All of the music is parameterized anyways, and since chuck understands OSC, I thought this might not be so difficult. I do realize that it's not easy though, especially since I have no experience with this. So I'm looking for some way to let the audience affect "something" that sends data to chuck (preferably by osc). Hopefully something that'll allow a crows (at least more than a handful) of people to interact in a way that they can actually recognize they're in fact affecting the music, although no in a precise, "solo-instrumentalist" kind of way, more of a collective gesture. I googled a bit, but didn't hit anything useful (maybe because I don't know how to ask), so did anyone here try something similar? Any tips, hints, software, approaches, not-tos, links, whatever would be highly appreciated. Anyways a few thoughts: 1) Something that reads from an usb-device and sends OSC would (I think) be easiest to handle. 2) I keep coming back to a web-cam based solution, since it's easy to carry and setup + all tweaking is done in software, as opposed to building some huge, DIY hardware controller. We already have a VJ, so e could project some of the input to provide visual feedback to the audience. 3) Another possibility is using some of the other ready-to-use, mass-produced (= cheap) controllers readily available, like a dance-mat (although that is limiting the amount of people able to interact with the system at the same time). Are there any obvious devices I should look into? -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://modlys.dk