The Chorus/Flanger Effect - Access Virus Rack User Manual

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 periodi-
cally. 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 mod-
ulated in a different manner than the
right, so a chorus effect is great for con-
verting mono signals into stereo signals.
If the delay is less than approx. 10 milli-
seconds, than the effect is called flang-
ing 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 differ-
ently - in reverse phase - by the LFO.
Locate the parameter group CHORUS in
the EFFECTS menu.
01111111111111111112
1 CHORUS
Dir/Eff
61111111111111111154
CHORUS DIR/EFF determines the balance
between the original signal and the pro-
cessed 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 gen-
erate 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 stereo-
phonic: Stereo positions as well as pan-
orama modulations and stereo spread
values that you have dialed in elsewhere
remain intact in the effects signal.
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ACCESS VIRUS RACK 49
The Chorus/Flanger Effect