Hi - Funny thing about this request, is I knew how to do this 15 years ago. At that time, my partner and I had a live weekly internet radio show, using a Real Audio server in Michigan (we're in South Florida) way before anyone ever heard the word "podcast." I used my Mixpad 12 to feed the mic's and music from a PC and via a 2nd computer, sent it out to the Real Audio server. Now, my partners and I are looking to create a new podcast for the fire service. I still have all my equipment. But the time passed ate away at a few of the brain cells. I'm using the same Mixpad 12 and have fed the mic's in to their jacks. I have an audio feed from one computer into the pad's "Tape/CD" RCA jacks. I'd like to avoid using a second computer and would like to feed the return to the line in on the computer, creating a full loop. I'm using Audacity for my software. The problem is that while I can hear the computer's output through my headphones connected to the mixer, the computer is not receiving any inbound sound. I've probably plugged the 1/4" jacks into the incorrect one on the mixer. I've tried both the aux and the returns, with no luck. Any ideas or advice? Thanks very much.