Lexicon
3-66
PCM 81 User Guide
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 Eb2 - -Eb4
vocal: baritone Ab2 - -Ab4
vocal: tenor C3 - -C5
vocal: alto F3 - -F5
vocal: soprano C4 - -C6
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.
Splice
This parameter allows you to change the amount of time used to crossfade the
splices that occur whenever pitch is shifted. A value of 8ms is appropriate for
most material. Higher values will produce longer/smoother cross-fades, but the
intelligibility of transients and high frequency content may be affected. Lower
values will reproduce transients more accurately and have more high frequency
content, but the splices may be more audible.
Shift Cents
This parameter determines the amount of fixed shift for the stereo input
channels. The value is given in cents (1 cent=1/100th of a semitone, 1200 cents/
octave). The range is adjustable in increments of a single cent. This value can
be modulated smoothly with patch sources to create vibrato and other pitch-
related special effects.
Shift Semitones
This parameter provides ±1 octave of pitch shift in half-step (chromatic)
intervals.
Note: As the Cents and Semitones controls are additive, it is possible to shift
tones by as much as ±2 octaves.
Shift Row
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