Lexicon NUVERB - FOR MACINTOSH Manual page 87

NuVerb User Guide
Diffusion, Predelay, Reverb Level, and Rolloff
DIFF (Diffusion) 0 - 99
DIFF controls the degree to which initial echo density increases over time. High settings of
DIFF result in high initial buildup of echo density, and low settings cause low initial buildup.
Echo density is also affected by SIZE; smaller spaces will sound denser. To enhance percussion,
use high settings of diffusion. For clearer and more natural vocals, mixes, and piano music, use
low or moderate settings of diffusion.
PDLY (Predelay) 0 - 1000ms
PDLY adjusts an additional time delay between the input of signal and the onset of reverbera-
tion. The control is not intended to mimic the time delays in natural spaces. In real rooms the
build-up of reverberation is gradual, and the initial time gap is usually relatively short. Natural
spaces are best emulated by setting SHAP at a middle value and adjusting SPRD for the desired
effective pre-delay.
Additional delay added with the PDLY control can increase the initial time gap slightly,
emulating a situation where reverberant pick-up microphones are located much further from
the source than the main microphones. If less than about 30ms of pre-delay is added, this
additional delay can add clarity with some music, but it can also sound unnatural. Large pre-
delays can be useful for slap-echo effects.
RLVL (Reverb Level)
RLVL sets the amount of reverberation in the processed signal. It is normally FULL, but may
be reduced for effects where the pre-echoes should dominate.
ROLL (High Frequency Rolloff) 0.1 - 26.5kHz, Flat
ROLL sets the frequency above which a 6 dB/octave low-pass filter attenuates the processed
signal. It attenuates both pre-echoes and reverberant sound. High frequencies are often rolled
off with this parameter, resulting in more natural sounding reverberation.
Pre-Echoes and Feedback Pre-Echoes
The Random Hall effect contains four pre-echo taps with delay and level controls. The taps are
fed directly to the output wet signal rather than into the reverberator.
Off - 48dB - Up Full
Reference
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