3-15
Algorithms and Parameters
PCM 81
THE PARAMETERS
PCM 81 parameters are organized into labeled rows within each
edit matrix. Although there are similarities among all matrixes, such
as having a row of Controls first, and Modulation and Patching
rows last, some of the parameters within each row, and some entire
rows are unique to specific algorithms.
This section contains descriptions for all PCM 81 parameters,
organized alphabetically by row label as follows:
• Chorus • Modulation
• Controls • Panning
• Delay Time • Patching
• Feedback/Cross-Feedback • Pitch
• Filters • Resonance
• Glide FX • Rvb Design
• Levels • Rvb Time
Individual parameter descriptions within each row are presented,
as far as possible, in the order in which they appear from left to
right in the edit matrix.
CHORUS
In the Chorus+Rvb algorithm, Row 5 provides parameters which
provide rate and depth controls for each of the six chorus voices,
as well as master rate and depth controls.
MstDepth and MstRate
Two Master Chorus parameters in the first row position allow
Chorus, Depth and Rate for all voices to be simultaneously scaled.
Each control has a range of 0-200%. Press Load/✱ to toggle
between MstDepth and MstRate.
Voices (Depth and Rate)
Each voice position has Depth and Rate controls to set the time
range (delay) and rate of change across that time range (pitch) of
the chorusing effect. (Press Load/✱ to toggle between them.)
Depth provides settings of 0-500ms in single millisecond
increments. Rate parameter can be set to 0Hz (Off), or to one of
one-hundred selections from 0.01-3.50Hz. Depths of 10-30ms
combined with Rates as high as 0.50Hz provide subtle chorusing
and multivoicing effects. Depths of hundreds of milliseconds
combined with higher Rates provide a wide range of pitch shifting
effects.
CONTROLS
Row 0 of every algorithm contains parameters that provide
overall control of both the reverb and voice effects.
Mix
Mix controls the ratio of dry and wet signal present at the PCM 81
outputs. When the PCM 81 is patched into a console or an
instrument amplifier through an auxiliary or effects loop, this
control should always be set to 100% wet. (Control Mode 1.1
allows you to select a global Mix setting.) When an instrument is
plugged directly into the PCM 81, a setting between 45 and 65%
is a good starting point.
. . . continued on page 3-16
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