DAT/Video - if it's a couple of phono sockets use those. As for the card - you mean it detects when a jack is inserted? Do you have any front-mounted audio sockets? Is there an icon near your clock in the right hand bottom corner relating to audio when a device is plugged in? If it's like the Realtek audio devices you need to disable detection of jack insertion/removal and set the output(s) to Line Out or Headphones.