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Shelf
This parameter effects all lter types. The shelf species the audio level below
which the lter has no effect. For example, let’s imagine we’re using a one-pole
lowpass with shelf set at -12 dB. The lowpass lter affects only the strongest 12
dB of the signal. Below the shelf, the signal is unltered. This is easy to under-
stand by viewing the EQ window.
Size (Reverb Size)
Size corresponds roughly to the length of the longest wall of a rectangular room.
In a more general sense, it corresponds to the overall dimension of some mythi-
cal space. This space has a geometry that causes sound to bounce around.
When the room size is small, the “walls” of this space are closer together and the
resultant reection density increases. When the room size is large, that density
decreases. The most natural reverbs use room sizes that vary from about 24
meters to 45 meters or so, but there are many useful reverbs that are outside of
this range.
There is a relationship between this parameter and the Reverb Time parameter.
Please see the Reverb Time parameter for clarication.
Spread
See Shape
Spin (and Wander)
These two parameter control randomization effects within the reverb. Random-
ization is used to control the spectral purity of the reverb. It can also—at some
settings—create a more noticeable modulation effect. Articial reverbs some-
times create audible artifacts with some types of signals. For example, a voi-
ceover in a very small room might sound a little metallic. Randomization works
to minimize these effects and remove the sense of ringiness.
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