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124 Chapter 11 Reverb
Plates and Digital Reverb Effects
The first form of reverb used in music production was actually a special room with hard
surfaces (called an echo chamber). It was used to add echoes to the signal. Mechanical
devices, including plates and springs, were used to add reverberation to the output of
musical instruments and microphones.
Digital recording introduced digital reverb effects, which consist of thousands of delays
of varying lengths and intensities. The time between the original signal and the arrival
of the early reflections can be adjusted by a parameter commonly known as predelay.
The average number of reflections in a given period of time is determined by the
density parameter. The regularity or irregularity of the density is controlled with the
diffusion parameter.
This chapter describes the reverb effects included in Logic Express:
 “AVerb” on page 124
 “EnVerb” on page 125
 “GoldVerb” on page 126
 “PlatinumVerb” on page 129
 “SilverVerb” on page 132
AVerb
The AVerb is a simple reverb effect that uses one parameter to control both the effect’s
early reflections and diffuse reverb tail: Density/Time. Small value settings tend to
generate clearly discernible early reflection clusters, generating something similar to an
echo. High values result in a reverb-like effect.
The AVerb is a quick and easy tool for creating a range of interesting sonic space and
echo effects. The AVerb may not be the best choice for the simulation of real acoustic
environments, however.
 Predelay: Determines the time between the original signal and the early reflections
of the reverb signal.
 Reflectivity: Defines how reflective the imaginary walls, ceiling, and floor are. How
hard the walls are, and what they’re made of, in other words; glass, stone, timber,
carpet, and other materials have a dramatic impact on the tone of the reverb.
 Room Size: Defines the dimensions of simulated rooms.