This video tutorial will explain how to configure your Line 6 device as an external sound card (the video uses a POD Studio UX1 but the procedure is identical for all Line 6 USB capable devices) for the Windows XP operating system.  Be sure to have your speakers or headphones connected directly to your Line 6 device to ensure you will hear audio playback.

You can also view this video on Youtube at:

http://www.youtube.com/watch?v=HfG6Ei_Yxf0