I need a sub port for my audio interface on my laptop.

Hi,
The following information describes my laptop: Dell Vestry 3400, 4 USB2 ports, 1 Sub/Sate port and 1 fire wire port. Now, I usually play my audio with my Audio Ionic U22, the track ball mouse and a keyboard; all via the sub ports. I also have an external Hard Disk Sate 2 and 4 USB1 ports Sub hubs. The issue I am having is a sub for my audio interface. Someone please help.
