Mac OS X Stuff and Links
Playing line in
If you want to play sound from the line in to your internal speakers than you can't do it in a simple way. In other words, in default installation there is no option like route line-in to internal speakers. If you google on the Internet you'll find different solutions to the problem. Mainly, all of the pages suggest that you run some other program (e.g. Garage Band, QuickTime) that will route line in to the speakers. I solved this problem using a freeware called line in from the Rogue Amoeba. This is a small tool that will allow you to select input and output and request them to be connected.