If you've had experience dj-ing then it shouldn't take long to get to grips with a software mixing program. You should be up to speed after a couple of hours practice, you just have to learn a few extra things like setting start points in the track, and using pitch bend instead of scratching. Of course, I recommend Virtual Turntables for the job.

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DJTJ

Try MJ Studio @ www.d-lusion.com... It it mostly similar to the "normal" vinyl DJ environment.