MORE AND MORE “DJS” are really spinning MP3s. Richie Hawtin (“Plastikman”) is now using Final Scratch exclusively, I’ve heard.
A few audiophile-poseurs will complain about the sound quality, but really most club systems (which tend to emphasize volume, not quality) won’t let you hear the difference anyway. In most clubs in Europe (and in a smaller, but surprisingly large, number of clubs in the States), the sound systems aren’t even stereo.