I am interested in doing some 5.1 mixing in Soundtrack Pro 2, but I currently do not have any audio hardware. I am interested in knowing if I need to purchase an audio interface like Presonus' FIREBOX or if I can just run to Fry's and pick up a cheap 5.1 receiver and connect it via SPDIF. I just bought Final Cut Studio 2, so I'd prefer not having to shell out another $500-600 to be able to do this. Does Soundtrack require a Firewire device or just any piece of hardware that supports 5.1?