Lexicon PCM 81 - REV, User Manual

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The Algorithms and Their Parameters
FX HiCut, FX LoCut
These parameters control stereo high cut and low cut filters on the algorithm
outputs. Each has a range of 20Hz- 20kHz.
Detect
This parameter displays the source used for pitch detection: Input, Fixed or MIDI.
Input Pitch is detected from the sum of the left and right input signals. The
detected pitch and the number of cents sharp or flat is displayed and
updated in real time.
Fixed ADJUST scrolls through the range of available pitches. The number
of cents sharp or flat from the selected fixed pitch is displayed and
updated in real time.
MIDI This setting is displayed when you use a MIDI keyboard as the note
detect source. Connect a MIDI keyboard to PCM 81 rear panel MIDI
IN jack and set both to the same MIDI channel. Whenever a preset
that uses the PitchCorrect algorithm is running, the shifter will
detect the pitch of any MIDI key you press. The display will show the
MIDI pitch and the number of cents sharp or flat in real time as the
pitch of the input signal varies. Correct the pitch of any melody by
simply playing the appropriate MIDI key when ever the melody pitch
drifts from the desired note.
Correction
This parameter lets you control the amount of off-pitch correction (0-100%)
applied. When set to 0, no correction is applied. When set to 100%, notes are
shifted as close as possible to the frequency of the detected pitch (or to the
frequency of harmonies of the detected pitch).
GldResp
This parameter is similar to the GldResp parameter found in the Master Delay
parameter of several PCM 81 delay and reverb algorithms. It sets the pitch
shifter’s responsiveness to the pitch detect source and also to modulation by
internal controllers (LFO, AR etc.) and MIDI controllers (aftertouch, velocity,
etc.) At the highest setting (100), the pitch will track the detect source very
closely. At lower settings, the pitch will lag behind the modulation source. A
setting of about 50 generally yields good results for tracking vocals.
Tracking
This parameter controls how quickly (accurately) the pitch detector will follow
pitch changes in the detect source. This control can be set to Fastest, Fast,
Moderate, Slow or Hold.
Fastest This is generally the most useful setting as it provides
accurate tracking as well as good handling of vibrato or pitch
bends.
Fast, Moderate
and Slow These settings are useful for special effects.
Hold This setting freezes at the last detected pitch, effectively
turning any melody into a pedal tone.
The Pitch Correct
Parameters
Controls Row
Pitch Row