Correction; Low Pitch And High Pitch - Lexicon PCM 81 - REV 2 User Manual

Algorithms and Parameters

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, These settings are useful for special effects.
Moderate, This setting freezes at the last detected pitch,
and Slow effectively turning any melody into a pedal
Hold tone.
3-56

Low Pitch and High Pitch

These controls allow you to set a range of pitches to be detected.
This is very useful with source material that has extraneous noise,
for example, a vocal track which contains some headphone leakage
picked up by the vocal mike. If Low and High Pitch are set to
bracket only the vocal frequencies, there will be no glitches caused
by the shifter detecting headphone material outside the vocal
range.
Note that Low Pitch also affects the amount of time that the pitch
shifted material is delayed. At the lowest setting, the amount of
delay is about 60ms. At the highest setting it is about 20ms.
For reference, a list of the lowest and highest pitches of some
typical sources is shown below.
vocal: bass
vocal: baritone
vocal: tenor
vocal: alto
vocal: soprano
Tuning
This parameter allows you to set a reference frequency for the
pitch, "A". The range is from 410.0-470.0Hz. The standard
reference frequency is 440.0Hz.
Lexicon
Eb2 to -Eb4
Ab2 to -Ab4
C3 to -C5
F3 to -F5
C4 to -C6