Lexicon 300 - Page 60

me Algorithm and their Pammeters
SlZEsetsthe rateof buildupof dffusionaftertheinitialperiod(which iscomroiled
StZB
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 equa! to the
longest dimension of the space. Moving SIZE while a signal is present may
cause audible transients on crftical 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 character-
ized by a rapid buildup of diiusion. However, both small and large spaces
frequently have an uneven buildup of inkial reverberation. This uneven buildup
is controlled by the SPRD and SHAP controls.
Random Hall and Feedback Pre-Echoes Pages
The Random Hall Pre-Echoes page andthe Feedback Pre-Echoes page contain
four pre-echo taps with delay and level controls. The taps are fed directly to the
output wet signal rather than into the reverberator.
Pre-echoes can best be understood by visualizing a stage where the early
reflections are the sounds emanating from the rear and side stage walls directly
afterthesoundfrom the stage. Usuallythe rearstagewallreflectionisearlierand
louder than those from the two side walls. The pre-echoes are actually clusters
of echoes, with the density of the cluster set by DIFF.
The pre-echo delay parameters change the perceived locations of reflecting
surfaces surrounding the source. Level adjusts the loudness of the reflection.
Foreach of the Lvl (Pre-echo level) parameters, there isacorresponding Dly pa-
rameter. Eachofthesesetsthedelaytime in msforoneofthe pre-echoes.These
are not affected by PDLY, so pre-echoes can be placed to occur before the re-
verberation starts.
The Dly pre-echo delay parameters have a resolution of 2 milliseconds.
The Lvi pre-echo level parameters have sixteen steps, calibrated in decibels.
The Fbk feedback parameters (for Delays 3 and 4 only) are adjustable in 6%
increments from -93% to +93%.
Pre-Echo 1, one second maximum to left channel.
DLYl , LVLI
Pre-Echo 2, one second maximum to right channel.
DLY2, LVL2
Pre-Echo 3, 2.8 seconds maximum to left channel, with feedback.
DLY3, LVL3, FBKk3
Pre-Echo 4, 2.8 seconds maximum to right channel, with feedback.
DLY4, LVL4, FBK4