Noise Gates are used to mute a signal whenever the signal level drops below a specified threshold.
The control dialog has two different layouts, one for a single channel selection, and another for a multi-channel selection. Multi-channel blocks will have meters available in a window accessible via the meters button.
A meter & numeric display indicate the current amount of gain reduction being applied.
Right-clicking over certain settings will provide a menu of additional options. Control Dialog Boxes for Noise Gates can be minimized to create user control surfaces (see Customizing Component Objects).