So got my new Macbook Pro Retina and I must say it's really nice. Surprised about the number of apps I use that are already updated or at least look really good. A couple things are blurry but nothing major. However one major thing that I need to solve is how do I get a line-input? I thought the headphone jack would double as both but it doesn't seem that is the case unless I'm doing something wrong. Anyone have suggestions?? Something tells me I'm going to have to go the USB adapter route.