1. Reverberation 2. An effect produceced by a processor which simulates natural reverberation. Such processors are called "effects units" or "reverb units". see reverberation

An spacial effect applied to sound that mimics the acoustic of different rooms from small closets to large cathedrals and arenas.

The persistence of an acoustic signal after the original signal has ceased.

Acoustic ambience created by multiple sound wave reflections. A diffuse, continuously smooth decay of sound = gradual echo.