Lexicon PCM 81 - REV, User Manual, Page: 85 / 174

Lexicon
3-24
PCM 81 User Guide
The Modulation row, which is the same for every algorithm, contains the
parameters for the PCM 81's internal modulation sources. Use the Patch row to
assign these modulators to any PCM 81 effect parameter.
Mod: LFO
Four parameters are available: Shape, P Width, Depth, and Rate.
Shape allows you to select the wave shape which will be used when "LFO" is
selected as a patch Source. The choices are:
Sine
Cosine
Square
Sawtooth
Pulse
Triangle
P Width determines the proportion of each pulse wave cycle for which the LFO
is on (1-99%). For example, setting P Width to 50% means that the LFO is on
for half of its cycle. The effect of this control will only be heard if you are using
the Pulse shape.
Depth scales the output of the LFO from 0 to 100%.
Rate sets the speed (0-25Hz) at which the LFO cycles. It can be set in time
values (such as 1.5Hz) or in tempo values (such as 3:2 cycles per beat).
Simultaneously pressing Up and Tempo will toggle these two display options.
Note: The PCM 81 allows six LFO shapes (sine, cosine, sawtooth, triangle,
square and pulse) to be selected as patch Sources, as well as the LFO itself. All
of these are generated by a single LFO, and are controlled by the single Rate
control. When "LFO" is selected as a patch Source, the output will be the Shape
selected here. The amplitude of the LFO output is controlled by Depth. Both
Shape and Depth are available as patch Destinations and can be controlled
externally. Shape, Pulse Width, Depth, and Rate are all available as patch
Destination parameters, and can be controlled externally.
See Patching in
Chapter 2.
Modulation
Shape, Rate and Depth can be controlled by a patch.