Networking between two computers should be pretty fast. There are certain ways to use firewire connections to transmit information rather than a ethernet cord which I've heard should be the same as using an outboard dsp card. It's all a matter of getting some kind of network audio protocol program that makes one computer send digital audio information to another. I believe on a Mac there is Soundflower, AudioHijack a couple that do that I dunno about Windows XP though.
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