When using reverb in audio it is important to remember what reverb is and how it effects your audio signal - in this article we will be looking at reverb in detail. Before we start I should mention that 'reverb' is a shortened version of the word 'reverberation' and is usually a sort of slang term used by audio engineers.
Have you ever heard a composer or a musician mention a 'wet mix' or a 'dry mix'? These two terms relate directly to reverb in audio. A wet mix is a recording that has had the effect we are talking about added to the finished article whilst a dry mix is a recording that has not had any of this effect applied. Reverb in audio adds a kind of space to the overall mix - it gives the feel of life around each instrument.
This effect is not a direct echo - an echo is a completely different effect used in audio engineering, Reverb in audio is when the sound waves reflect off surfaces and reach the listening ears at different periods. When a sound is created there is always a 'direct sound' that the listener hears. The reverberation of the sound is the sound that is not direct, the sound that bounces of the walls etc and generally take longer to reach the listeners ears.
So reverberation in audio is made up of many reflections or echoes that merge together. This is what gives the listener the effect of a single process instead of many different direct echoes. It stands to reason that some rooms will have a lot more reverberation going on than other rooms. Have you ever stood in the middle of a church and shouted - a church will give you a wide powerful effect.
Most studios use digital reverberation these days to reproduce different sized rooms and their effect. The parameters are obviously adjustable so you can create the room size you are after. Unfortunately, a lot of musicians tend to not know how to use this effect correctly. I constantly hear recordings that have been ruined by over-use of the reverb effect. Over using reverb in audio will result in that particular signal sounding 'distant' or 'muddy'. Single instruments tend to need much less of this effect than people realize - I would say in most cases no more than 25% reverb against the direct 'clean' signal. It's only when you have operatic vocals or an orchestra should you think about going any higher than this ratio.
Source: http://www.streetarticles.com/music/reverb-in-audio
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