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- Click the gray "System Preferences" icon in your MacBook's Dock. Click "Sound" in the Hardware group.
- Click the "Input" tab to access microphone settings. Click "Internal Microphone" in the devices list to adjust the microphone settings for your Mac's internal mic, or click the name of any external USB microphone you have installed.
- Slide the "Input Volume" slider to the right to increase the microphone's volume, or slide the slider to the left to decrease the volume. Click the "Use Ambient Noise Reduction" check box to help reduce background noise when using your mic.
- Close the sound settings window after you adjust your microphone.