Disable sound output device in 12.04?

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http://askubuntu.com – I need to be able to disable a sound device in 12.04. I was able to do this in 11.10 using the Sounds Setting app, and it worked like a charm. The new Sound Settings app doesn't seem to have the capability of outright disabling an output device. I'm trying to disable a AMD HDMI sound device associated with my Radeon HD 6870 Video card. Thanks for any advice! (HowTos)