You can use Audio MIDI Setup to configure the audio input and output devices you use with your computer, such as microphones and audio playback equipment. The settings you can change in Audio MIDI Setup depend on the audio device you are using. For example, you can adjust the level for each channel your audio output device has available, if the device supports changing the level. To learn more about using Audio MIDI Setup, open Audio MIDI Setup, in Applications/Utilities, and choose Help > Audio MIDI Setup Help.

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