Cooler Master Sirus - 5.1 - Manual (Page 19)

 Microphone Features
Volume control
Just like for the speakers there is a volume panel for the MIC as well to either mute it or
adjust its sensitivity. Try different settings until you find a sweet spot of high enough
sensitivity and low background noise and white noise.
Volume control bar:
Monitor Vol. - It provides Monitor volume level adjusting of Mic-IN device.
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