Hi, those double jacks never give proper sound when connected like that - I found the same when I tried it. I now have a WinTV card and my soundcard is Creative Audigy2, with this combination I have pc connected to TV/Vid/HiFi and Cam. I have two spkrs on pc, two on tv, two on hifi - all can be on at once or just those I choose at any time. I can also watch tv on pc, or pc on tv - this way I can also record pc output to vcr. lol.