Sets the amount of high frequencies that will be cut.
You can set it depending on the kind of room you are trying to simulate:
Setting the damping high will be a softer room.
Bandwidth:
Sets the frequency range at which damping will happen.
The less bandwidth you use the warmer or less harsh the reverb will be as a whole.
Predelay:
This is the amount of time it takes for the sound to create its first reflection and is the first timed or rhythmic element in your reverb.
Density:
This is the space between the first reflection and all the following reflections.
Decay:
This determines how long it takes for the reflections to fade away.
Size:
Sets the size of the room.
Level:
Sets the overall level of the output.
Early Mix:
Sets the level of the very first reflections when the sound hits the surfaces in the room.
Adjusting early mix and decay at the same time can give some control over placement of the reverb from the front to back of the room.
Mix:
This is the dry/wet control.
At 0%, no reverb effect is applied to the sound source.