Apps to mix sound files in real time, using two soundcards?

Can someone recommend some applications for linux to mix audio files (mp3, ogg) between two soundcards?
in realtime... you know, like DJs do, etc...
TIA, and sorry for the bad english
luciano

I think if you use more than one card at a time you're going to run into latency issues, since there is no guarantee that the output from two or more cards will be synchronized. If you really need more than two channels out, a better solution is to purchase a professional card with as many outputs as you need. Also, I don't think Jack (the standard for audio work in Linux) supports the use of more than one card at a time.
I can't think of a reason you would need more than two channels (one left, one right) unless you're trying to DJ in surround sound. Don't DJs using traditional gear just run a pair of turntables through a crossfader?
I haven't used the program, but Mixxx looks like the best Linux software for DJing. You might take a look at it first.

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