Mutli channel audio output via usb?

Hi there
I've had a browse through the support forums and can't find an answer to my question, so here it is:
I want to split the audio channels through the internal soundcard (I have an ibook g4) so that I can use audio mixing software.
Before I go out and buy some usb speakers, I was wondering if connecting speakers through the usb port would automatically do this - or, is there a way to assign an output route for each channel within the computer?
Any help is much appreciated.
Thanks

You'll need a "usb soundcard" that you can purchase from both apple store or just google it and I'm sure they have them all over the place (ebay, thinkgeek, ect). The built in soundcard is a 2 channel 44khz sound card with 1 output and 1 input via the built in microphone. Also, the only usb speakers I have ever seen are just usb powered, but they still plug in to the headphone plug.

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