Lexicon PCM 81 - REV 2 - Shift L+R; Tips for Setting Pitch Parameters; Using the Submixer

3-45
Algorithms and Parameters
PCM 81
Voice 1-4 (or 1-2)
These parameters determine the amount of pitch shift for the left
and right input channels. In the Quad Shift algorithm, Voices 1 and
2 are left shifts and 3 and 4 are right shifts. In the 2-Voice
algorithms, Voice 1 is left shift and Voice 2 is right shift. The value
is given in cents ( one cent is equal to 1/100th of a semitone —
there are 1200 cents per octave, as shown below). The full range
of pitch shift is up or down three octaves (+3600 cents). The range
is adjustable in increments of a single cent. These values can be
modulated smoothly with patch sources to create vibrato, Doppler,
whammy bar and other pitch-related special effects.
0
+100
+300
+200
+400
+500
+600
+800
+700
+900
+1000
+1100
+1200
+1300
+1500
+1400
+1800
+2000
+2200
+1600
+1700
+1900
+2100
+2300-300
-100
-200
-400
-500
-600
-900
-1100
-700
-800
-1000
-1200
-1300
-1400
-1600
-1800
-1500
-1700
-1900
-2000
-2100
-2300
-2200
-2400
Shift L+R
In the Stereo Shift algorithm, this parameter determines the
amount of pitch shift for both the left and right channels. This is a
true stereo pitch shifter. The left and right channels are sample
synchronous to maintain stereo imaging.
Tips for Setting Pitch Parameters
All pitch shifting algorithms will produce some amount of glitches
and all pitch shift algorithms have some amount of built in delay.
Single note sources shift best. When shifting single notes, Low Pitch
should be set at or below the lowest pitch in the input material.
When shifting chords or full bandwidth material, first set the
amount of shift. If you need to minimize the delay caused by the
shifter, set Low Pitch to the lowest value and slowly increase it to
the highest value that doesn’t produce unacceptable glitches.
The Splice parameter generally works best for most material when
set to 4ms. If the shifted audio sounds a bit harsh, you can smooth
it out by raising this value. If there is a loss of intelligibility or
rhythmic accuracy in the shifted audio, try setting Splice to a
smaller value. As with most effect parameters, you should rely on
your ears to find the best settings for a given situation.
USING THE SUBMIXER
Expanded configuration control is available in those Pitch
algorithms which have a Submixer incorporated into each
algorithm. This Submixer lets you arrange any combination of
reverb and effects blocks in any configuration simply by changing
the three main Submixer controls: Sends, Returns and Routing.
Additional controls are provided for each block: Input Level, Input
Width, Output Width, Output Level, High Cut and Low Cut filters,
and Wet/Dry Mix.
The Submixer appears as row 1 on the parameter matrix (pictured
on the next page). The first three parameters in the row are the
basic Submixer controls: Sends, Returns, and Routing. Any
configuration can be achieved by simply adjusting these three
parameters.
The key to using the Sub Mixer parameters is understanding what
the Sends and Returns parameters do, and how they interact with
the Routing Parameters.