Lexicon NUVERB - FOR MACINTOSH Manual page 106

Reference
SIZE
SIZE sets the rate of buildup of diffusion after the initial period (which is controlled by DIFF).
It also acts as a master control for RTIM and SPRD. The SIZE control changes a reverb sound
from very large to very small. Generally, you should set the SIZE control to approximate the
size of the acoustic space you are trying to create, before adjusting anything else. The size in
meters is roughly equal to the longest dimension of the space. Moving SIZE while a signal is
present may cause audible transients on critical material.
The apparent size of the space created is actually a combination of the settings of the SIZE,
SHAP, and SPRD controls. Small acoustic spaces are characterized by a rapid buildup of
diffusion. However, both small and large spaces frequently have an uneven buildup of initial
reverberation. This uneven buildup is controlled by the SPRD and SHAP controls.
SHAPE
SPREAD 0 - 202
SHAP and SPRD work together to control the overall ambience of the reverberation created by
NuVerb. SHAP determines the contour of the reverberation envelope. With SHAP all the way
down, reverberation builds explosively, and decays quickly.
As SHAP is advanced, reverberation builds up more slowly and sustains for the time set by
SPRD. With SHAP in the middle, the buildup and sustain of the reverberation envelope
emulates a large concert hall (assuming that SPRD is at least halfway up, and that SIZE is
suitably large—30 meters or larger.)
SPRD works together with SHAP to control the duration of the initial ambience created by
NuVerb. Low SPRD settings result in a rapid onset of reverberation at the beginning of the
envelope, with little or no sustain. Higher settings spread out both the buildup and sustain.
XOVR (Bass Crossover) 0.1 - 26.5kHz
XOVR sets the frequency at which the transition from RTIM to BASS takes place. XOVR should
be set at least two octaves higher than the low frequency you want to boost. For example, to
boost a signal at 100 Hz, set XOVR to 400 Hz (This setting works well for classical music). XOVR
works best around 400 for boosting low frequencies, and around 1.5 kHz for cutting low
frequencies.
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