on debian 3.7.2 plug in usb, then type /bin/dmesg .... should get something like this towards bottom...
1.00 Device [Creative Technology Ltd Sound Blaster X-Fi Go! Pro] on usb-0000:00:1d.1-1/input3
[ 1403.745830] usbcore: registered new interface driver snd-usb-audio
that means linux sees it... now go into system systems > sound, and select sound blaster as your interface card...
I'm glad this worked for me, since I dropped my laptop and it landed on the sound card with earphones plugged in, and killed my sound. With the sound blaster card I got sound again. Praise God! Jesus Saves!