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Diffusion
Input diffusion is the first part of processing for any signal entering a reverb or delay. It can be
described as a smearing or softening of the signal and is typically used to lessen the impact of
strong transients.
Shape and Spread
The Shape parameter is closely tied to the Spread parameter. Shape controls how energy is
injected into the reverberator. A low value means that sound enters the reverb at the beginning
of the spread window. A high value means that most sound moves into the reverb at the end
of the spread window. A value somewhere in the middle means that sound enters the reverb
evenly across the spread window.
Tip: Shape will not have
this effect if spread is at its
minimum value. But even then,
it can make a difference. In this
case, it affects reverb timbre
and density. Higher values of
shape may be both darker and
denser, although the effect is
subtle.
Spread is a window of time
during which a signal is
injected into the reverb. Shape
controls just how the signal is
injected during this window.
Together, the two parameters
create an envelope for the
early portion of the reverb, as
shown in this illustration.
Early
Reverb
Shape = 32, Spread = 20%
Shape = Anything, Spread = 0%
Shape = 64, Spread = 75%
Reverb
Tail
25
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