I have the same sound card, and after I connected the cable, I got sound from the Hauppauge app, but not from dTV. By changing the sound inputs on dTV, I was able to get sound. I had to put it to something that I didn't think made sense. Oh, here it is, in my post here: http://www.avsforum.com/ubb/Forum12/HTML/009596.html
Another thing that's odd, maybe, is that from dTV, once I got sound working from the WinTV app, in order to get sound in dTV I had to select 'MSP/Radio' as the Audio input...
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