im not classic, but, an audio interface is basically a professional soundcard. They come in all shapes and sizes and connections, pci, usb, firewire, pcmia (laptop thing). Some have breakout boxes, that have the actual connections. Hmm, yea thats basically it. How to use an interface is simple, it depends on how the connection is, and dont be pulling that 410 out with out safely removing it either, its gonna mess up the chip or somethin i heard.