Lexicon PCM 42 - 4.1.5 Vibrato; VIBRATO SETTINGS; 4.1.6 Pitch Twisting; PITCH TWISTING SETTINGS

4.1.5 Vibrato
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Figure 4.5-i — VIBRATO
The DEPTH and RATE of the vibrato are controlled with the corresponding VCO-SWEEP controls. Setting the VCO
WAVEFORM clockwise produces an interesting ‘‘trill’” effect.
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Vibrato ts the effect produced by small, regular varia- mY JT MIX all the way clockwise. Inflections can also be
tions in pitch. The PCM 42 can create a automatic vibrato ontroiled manually by the MANUAL VCO-SWEEP
for any instrument or sound. The DEPTH knob controls control, or by an external foot controller connected to
e oe of the vibrato, the RATE the VCO jack.
Use short delays with no feed ack
controls the speed.
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4.1.6 Pitch Twisting
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Figure 4.5-; — PITCH TWISTING
Radically altered swept pitches completely transform any instrument into something totally alien. For less extreme ef-
fects, turn down the DEPTH control.
When an audio delay line is modulated, as by the
VCO-SWEEP section of the PCM 42, a transient shift in
pitch occurs that is proportional to the rate of change in
rapid sine wave can produce some very unusual
sounds, indeed.
delay time. The effect is analogous to the acoustic ef-
fect known as Doppler shift. The use of larger amounts
of sweep at longer delay times produces exaggerated
bends in pitch which can be used for very odd special
effects. With the settings shown in the figure, the shift
follows the waveform of the modulation. The amount of
shift for a given setting of DEPTH increases with the
amount of delay selected by pushbuttons. The use of
waveforms such as envelope follower, square wave or
4.1.7 Stereo image Placement
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The VCO control jack on the rear pane! may be used
to inject any synthesizer waveform into the unit, pro-
vided the range of the waveform is 0 to +10 volts.
Many unique effects can be produced using common
synthesizer functions such as sample-and-hold, se-
quencer, pitch follower, envelope generator, or audio
oscillator. Pitch Twisting may also be controlled
manually by the MANUAL VCO SWEEP knob or by the
use of a foot pedal plugged into the VCO jack.
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Figure 4.5-k — STEREO IMAGE PLACEMENT
Delaying the right output causes the sound source to shift to the left. Adjust the delay between about 6 and 30 ms to
achieve the desired degree of shift.