Lexicon 300L -, Owner'S Manual

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4-13
The Algorithms and their Parameters
RTM (Reverb Time)
SHP (Shape)
SPR (Spread)
HFC (High Frequency Cut)
PDLY* (Pre-Delay)
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This control adjusts the reverberation time of the independent reverberator. The
range of action is limited. Be careful — both long and short reverb times may
sound unnatural. If a much longer or shorter reverb time than the preset provides
is desired, SIZ should be changed first.
SHP and SPR work together to control the overall ambience of the reverberation
created by the 300L. SHP determines the contour of the reverberation envelope.
With SHP all the way down, reverberation builds explosively, and decays
quickly.
As SHP is advanced, reverberation builds up more slowly and sustains for the
time set by SPR. Plates characteristically have small values of SHP and SPR.
SPR works together with SHP to control the duration of the initial ambience
created by the 300L. Low SPR 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.
SIZ allows you to vary the apparent size of the space over a wide range. SIZ is
the most dramatic control, and must be selected to match the music or program
material. It should be the first control that you adjust to tailor the desired space.
SIZ also affects the reverb time, in a similar way to the standard reverb programs.
HFC 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.
PDLY adds an additional delay to the reflections and to the reverberation. This
control may be useful in a sound reinforcement situation, or for ambience effects.
* A quick "double-click" on the slider button will allow you to control this delay with
more resolution. To exit this "fine control" mode, double-click on the button
again.
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BAS sets the reverb time for low-frequency signals, as a multiplier of the RTM
parameter. For example, if BAS is set to 2X, and RTM is set to two seconds, the
low frequency reverb time will be four seconds. For a natural-sounding plate
reverb, we recommend values of 1.0x or less.
SIZ (Size)
BAS (Bass Multiply)