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50 CHAPTER 4
Introduction
THE CHORUS/FLANGER
EFFECT
Another function that delivers
great effects based on pitch fluctuation
is the so-called chorus effect.
Chorus actually consists of a brief
delay (generally up to approx. 50
ms) which is varied periodically. By
modulating the delay, the delayed
signal is slightly detuned to the
input signal (the so-called Doppler
effect). This inconsistency in pitch
between the original and effects
signal is the source of the chorus
effect. Feedback in the delay line
enhances this effect. The left signal
side is automatically modulated
in a different manner than
the right, so a chorus effect is great
for converting mono signals into
stereo signals.
If the delay is less than approx. 10
milliseconds, than the effect is
called flanging or a flanger effect
rather than chorus. In this case
feedback is even more significant
because it generates resonances
that can be modulated and is thus
yet another source of radical sound
effects. If you determine high feedback
values, you can clearly hear
how the two sides of the signal are
modulated differently - in reverse
phase - by the LFO.
Locate the parameter group CHO-
RUS in the EFFECTS menu.
01111111111111111112
1 CHORUS
Dir/Eff
OFF≤
61111111111111111154
CHORUS DIR/EFF determines the
balance between the original signal
and the processed signal. The
parameters RATE and SHAPE control
another LFO that was installed
specifically for the chorus LFO.
DELAY is used to set the delay time,
DEPTH determines the modulation
intensity, and FEEDBACK controls
the feedback level. When you want
to generate a flanger effect, the
FEEDBACK parameter’s negative
control range lets you dial in softer
characteristics for the flanger.
Please keep in mind that the Chorus
section in the Virus is fully stereophonic:
Stereo positions as well
as panorama modulations and stereo
spread values that you have
dialed in elsewhere remain intact
in the effects signal.