How do I remove an unused audio driver?

In my System Preferences under Sound, I have an old device option showing up under Output for "Epson Projector Audio".  It's several years old and stems from a meeting I attended where there was an Epson projector with a wireless display interface.  You had to install software from a USB drive to use it (circa 2010).
Every once in a while, my sound defaults to this and I get no sound output until I go into preferences and change it back.  It also shows up as an input option under sound as well.  There is no "+/-" button to add or remove these drivers in the preferences pane so I am sure I must go and manually remove the files associated with them.  I have searched for any file named Epson*.* but can't find any. 
Can someone tell me how to remove these drivers?
Thanks a million!

You want to Hide the app in the App Store (as seventy one suggested). This will stop you from recieving notifications about updates.
In Mountain Lion, fnd the app in Purchases. Right click on it, and choose "Hide Purchase..."
For more info:
http://support.apple.com/kb/HT4928

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