The Noise Gate is commonly used to suppress unwanted noise that is audible when the
audio signal is at a low level. You can use it to remove background noise, crosstalk from
other signal sources, and low-level hum, among other uses.
The Noise Gate works by allowing signals above the threshold level to pass unimpeded,
while reducing signals below the threshold level. This effectively removes lower-level
parts of the signal, while allowing the desired parts of the audio to pass.