I just bought an iSight camera, and a large factor in the purchase was its high-quality (well, higher quality than my PB built-in mic) microphone. I figured it would be useful with Garageband. Unfortunately, when I go to GarageBand preferences to select the iSight mic, it appears grayed-out in the list of audio inputs. Does anyone know how to get GarageBand to connect to the iSight camera mic? Thanks!