The easiest way to Mac OS X audio settings is via the speaker icon in the menu bar:
When you click on the menu bar speaker icon, you can set the output volume.
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Audio in and output selections by right-clicking (also ns. ctrl + click works):
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You can found more sound settings when you select Sound Preferences... in the speaker menu.
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If you cannot find the speaker icon in the menu bar, you can get to the same settings as follows:
1. Select in the Apple menu (the left most apple icon in the menu bar):
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