Mac Audio Settings
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.
Audio in and output selections by right-clicking (also ns. ctrl + click works):
When you right-click on the menu bar speaker icon you can select the for audio in device:
When you right-click on the menu bar speaker icon you can select the audio out device:
You can found more sound settings when you select Sound Preferences... in the speaker menu.
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):
System Preferences...
2. In the System Preferences panel Hardware section, select Sound.
3. Select your audio settings on the Output and Input tabs.