Lexicon PCM 81 - REV, User Manual

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3-1
The Algorithms and Their Parameters
3
The Algorithms and
Their Parameters
There are three general classes of algorithm: 4-Voice, 6-Voice and Pitch. The
4-Voice algorithms: Concert Hall, Plate, Chamber, Inverse and Infinite each
combine a specific type of reverb with a 4-voice, general purpose stereo "effect
toolbox" which we call the Reverb Shell. These algorithms also provide "post-
processing" for the reverb. The 6-Voice algorithms: Glide>Hall, Rvb, M-
Band+Rvb, Res 1>Plate, and Res 2>Plate each combine a specific type of
reverb with a specialized 6-voice stereo effect. The Pitch algorithms: Quad>Hall,
Dual-Chmb, Dual-Plt, Dual-Inv, Stereo-Chmb, VSO-Chmb and Pitch Correct
each offer a unique type of pitch shifting, combined with an uncompromised
Lexicon reverb.
In this chapter, diagrams and descriptions of the Reverb Shell,and of the 4 and
6-Voice algorithms are presented first, along with pictures of each edit matrix.
The diagrams are followed by a glossary of parameter descriptions, organized
alphabetically by matrix row name. Within each matrix row, parameters are
organized as far as possible in the sequence in which they appear in the row.
The Pitch algorithms, most of which make use of a dedicated Submixer
incorporated into each algorithm, are described in the following section along
with operational tips on pitch shifting in general and the submixer in particular.
Most PCM 81 algorithms share the same general structure, shown below. The
shaded area of the diagram is detailed in the individual effect descriptions that
follow.
About the Algorithms
The PCM 81 uses 17 algorithms to create different types of effects. Each
algorithm includes an uncompromised stereo reverb effect, as well as several
voices of additional stereo effects. When you select any effect, the name of the
algorithm from which it was derived will appear on the upper display line.
Pressing Edit will display the last edited parameter in that algorithm's parameter
matrix.
The algorithm name appears on the upper line of the display
whenever an effect is selected.
Rvb
Press Edit to access the
parameter matrix.
P0 0.0 Prime Blue