how they'll benefit me and my current setup. I have an Intel iMac, and I'm using Garageband atm (soon to be Logic Studio); to record, I simply have a MIDI keyboard connected to my Mac via USB. How would an audio interface improve on this simple keyboard --> Mac connection? I then plug in my Shure earphones into the audio out port on my Mac, but I don't believe it's functioning as digital but as analog instead. So basically, two questions: 1. Why should I buy an audio interface when using a USB MIDI keyboard and how would it benefit me? 2. How can I enable digital out for earphones when recording (would I just plug them into said audio interface, which would presumably have a digital connection?) I've been recording for 5 years, first on PC, now mac, and I've never understood this. Thanks in advance.