Set the threshold of the noise gate. You’ll want to adjust it so that it turns on when the volume level of the audio you are processing falls below a certain level. In order to set this level to your liking, you’ll have to experiment. Setting the threshold too high will cause the noise gate to reduce the volume of content that you do not want to be attenuated. Setting the threshold too low will cause the noise gate to not effectively reduce the volume of the content that you do want to be attenuated.
Adjust the range of the noise gate next. The range will control how much the noise gate reduces the volume of the audio content once it falls below the threshold. Once again, experimentation is key in setting the range in order to get the results you are after.
Set the individual attack and release controls after you have adjusted the range. The attack will control how quickly the noise gate turns on after the level falls below the threshold. The release will control how quickly the noise gate turns off after the level rises back above the threshold.
Set the hold control to allow the noise gate to stay open for a set amount of time after crossing the threshold. The hold control is useful because it keeps a sustained note from being cut off abruptly in the event that the content crosses back and forth across the threshold while fading out.