See the following instructions for assigning your Line 6 device as a sound card for your Windows Vista Operating System:
1) Select the "start menu" and select "Control Panel"
2) Select "Classic View" if not already selected, then select "Sound"
3) Select the playback tab, then select your Line 6 device (this example uses a Toneport UX-1), then select "Set Default".
4) Select the Recording tab, select your Line 6 device (this example uses a Toneport UX-1), then select "set as default" (if applicable). Then select "OK"