Check if there's any sound coming from your microphone.

Alternative downloads

Stellar Volume Repair
Stellar Volume Repair
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Repair corrupted volume information on Mac.

Volume-Scroll
Volume-Scroll
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It lets you use your scroll over the menu bar and change the volume.

Xmart Volume
Xmart Volume
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It performs automatic volume control using the microphone of your Mac or iSight.

iTunes Volume Control
iTunes Volume Control
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Control the iTunes volume.

Volume Slider
Volume Slider
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Volume Slider allow you to control your computer's volume using a slider