The Creative Sound Blaster X-FI GO Pro is an external sound card (stick) connected via USB. The stick has a mikrophone input and audio output and supports the THX TruStudio Pro Crystalizer technique.
Currently, the card can not be used with Linux (Ubuntu 12.04, alsa-base 1.0.25, Kernel-Version 3.2.0). Although the USB stick is recognized by ALSA it will not produce any sound:
card 1: Pro [Sound Blaster X-Fi Go! Pro], device 0: USB Audio [USB Audio] Subdevices: 0/1 Subdevice #0: subdevice #0 Card0.Amixer.info: Card hw:0 'Interface'/'USB MIDI Interface at usb-0000:00:1d.0-2, full speed'
See bug report: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1012977.