Sony NWZ-S544 MP3 player and computer



Hello, I have a Dell Dimension 2400 running Windows XP Pro and would like to play my MP3 player through the computer sound card. I have the headphone (Out) plugged into my line in jack on the sound card. Iā€™m not getting any sound after I hit the play button. Do I need to have Windows Media Player on? Do I need to switch between Analog and digital? Thanks for any help.:confused: