Looking at the stuff on Mitch's website, you have to not only connect with USB but also with the audio connector. I use a UMPC mounted to my dash as my CarPC. Everything going into it goes through a USB hub in the glove box. I use an external USB audio card for audio out and it has a mic input. Now, my computer has no line in jack like you would have on a regular PC. Can I use the mic input on my external Audio card as the input for the Sirius adapter? Am I mistaken all together about having to hook up the audio jack? Do I have any other options? Already bought the SC-C1 tuner and want to make sure everything will work before I pick up the adapter.