Re: Audio From Gamecube->PC Speakers
Then the game cube box is set up to do that . The Svideo was designed as a complete video/audio connection to transfer both to the recieving equipment.
Now on some computers the video is not intgrated to the sound because of cost and mobo design layout issues. That could be the issue with yours too.
You can get a cable adapter that will allow you to plug the RCA plugs to a mini stereo plug that will fit into the input speaker jack of your sound card. Or you can purchase a high end sound card that has the RCA jacks built in