Reverb Plug-Ins : AIR Reverb : Reverb Controls : Reverb Room Section Controls

Reverb Room Section Controls
The Room section offers control over the overall spatial feel of the simulated room.
Ambience
This control affects the attack of the reverb signal. At low settings, the reverb arrives quickly, simulating a small room. At higher settings, the reverb ramps up more slowly, emulating a larger room.
Density
Adjust the Density control to change the rate at which the sound density of the reverb tail increases over time. Higher Density settings create a smoother reverberated sound. Lower settings result in more fluttery echo.