Ubuntu refuses to switch to usb audio device [Creative X-Fi HD usb]

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http://askubuntu.com – I am currently running a persistent live session of Ubuntu 12.04.1 LTS, installed on a 4GB flash drive. I own a Creative Labs X-Fi HD usb audio device, which I desire to use with my installation. Previously on Windows, I was able to simply plug the usb cable from the device into my laptop (HP dv6) and it would automatically switch to the device. However, when I plug the device in under Ubuntu, it shows up in sound settings as an audio output and also as an audio input The problem is, I cannot select the item to make it the output device, even though I can click on it (I also pressed "Enter" w (HowTos)