Yeah, it doesn't make sense that they would call the model a "Digital Audio" yet not include any sound input. Good thing they didn't codename a Mac "fast computer", or "Stable Mac". For sound input, I use a Griffin iMic. It's a little puck-shaped USB device that has a switch for both recording and sound input, and it doesn't require drivers. It gets the job done. If you're looking for anything beyond that, try the M-Audio line of interfaces. They have USB and Firewire type devices with XLR, RCA, 1/4", and 1/8" inputs. If you're looking for studio-grade components, the Mark of the Unicorn (MOTU) brand should fit the bill, but they're also $$. Eric Buczynski