So I have done some more digging into the PCIe interface, and I believe this links to be a good starting point.
Unlike all the current radio tuners on the market, I do not want to have to output the sound out back into the motherboard's onboard line-in input. I want the sound to be transferred through whatever connection technology we would be using.
Also believe some of these books may come in handy. http://www.amazon.com/s/qid=12274588...k%3Apci&page=1