I wonder if one ever exists... I mean, Bust-A-Groove is one thing, and Beat Pump Revolution makes another, and Simon Says yet another. And Audition is all three! If only we had one... think, people, THINK! =D!
Bust-a-Groove: Press said buttons within 3 beats, then press separate indicated button on 4th.
Audition: Press said buttons within 3 beats, press Spacebar on 4th beat/lighted portion of bar.
Aha, I used to hook up my DDR mat to the computer and play Audition although I'd still have to press the space bar but I'll try to reconfigure the settings so I could play entirely with my mat. That's be awesome.
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Audition simulator, eh...? 
