I don't know, I don't play DDR, but I don't think those kind of movements could approximate 'dancing' at that point. Although when you say 600bpm, is it 300 with more drums inserted on eighths/sixteenths, or whatever? Because a kick drum or something being played ten times a second would sound pretty crappy, I have to say. Although I don't know what type of song it is so I'm pretty much making an assumption on the sound. I'll have to check out a sample or something so I can understand what you guys mean when you say 300bpm, because what I'm imagining wouldn't be pretty. 😉