Lexicon PCM NATIVE - Page 58

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The Spread parameter is closely tied to the Shape parameter. 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:
Shape = 32, Spread = 20%
Shape = Anything, Spread = 0%
Shape = 64, Spread = 75%
Reverb
Tail
Early
Reverb