simple noise gate.
The Zimple-Gate is a noise remover software audio plug-in. The plugin is an Audio Units format, hence it can be used only in Mac OS X and it has been developed to be mainly used with Apple's Garageband software. While it may be used with other software as well, we do not fully support those.
A noise gate is generally used to remove unwanted noise or sounds from a recorded audio track. To operate the gate, you have to first set the Threshold level; any sounds on the track that have a an amplitude level below this threshold will be muted. Think about this as an actual gate that will close in front of any sound that is below this threshold and open for sounds louder than the threshold.