So I saw this guy who had a guitar effect that sounded sort of like a whammy pedal, except it was on a stand, and projected a beam of light into the air (I'm assuming a laser). The effect was modulated by him breaking the beam by karate chopping it, or moving his hand vertically in the beam, with pitch modulation as he moved his hand up and down... I've never seen anything like it but it peaked my interest. Anybody know what this might be? I think I could build one but it'd be nice to have something to go by. The other possibility is the audience was duped, and he really had some sort of Whammy pedal or pitch shifter being moved with his foot while he pretended to work the beam... but it looked really convincing. And I still think I could make something like that... using a laser (out of a laser measurement tool or something similiar) instead of a pot. I want to know what it is!