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Helpful answers
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Aug 5, 2014 10:02 AM in response to marshafromriby Jason L,Hi Marsha,
Welcome to Apple Support Communities.
The way to adjust sound or volume levels on your MacBook Pro may vary if you are using 3rd-party accessories, but these articles should provide the information that you're looking for.
Mac notebooks: Key placement and functions
http://support.apple.com/kb/HT3164
F10 - Mute
F11 - Volume down
F12 - Volume upOS X Mountain Lion: Change the sound input volume
https://support.apple.com/kb/PH10824
I hope this helps.
-Jason

