vMix Live Production Software Pro - Manual (Page 81)

vMix User Guide
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Compressor
Compressor is a standard dynamic audio compressor.
Ratio: Specify a Ratio other than 1:1 to turn on the compressor.
Threshold: Specify the sound level for compression. Any audio above the threshold will be compressed
(volume reduced) according to the ratio above.
Noise Gate
The Noise Gate is a handy way of reducing noise on an Audio Input such as a Microphone
It works by quickly fading out the audio when it drops below a certain dB (decibel) Threshold