11.0

584 EFFECTS MENU
CORVEX – Chorus/Flanger
When we talk about the chorus and flanger effects in CORVEX, we don't only refer to one
of the two effects, but also the variations between them which go beyond standard
concepts.
A chorus generates the typical 'floating' sound as known from guitar sounds or synthesizer
pads. You can add acoustic 'depth' to an instrument to add more power to the sound or
to create the illusion that it exists multiple times.
The chorus sound is created by using the so-called "Doppler" effect. You've probably
noticed this phenomenon in daily life: The sound of an approaching ambulance sounds
higher than when it is moving away. This effect is a result of the speed of the sound which
first increases and then decreases, thus also changing the sound pitch. The wave length
also changes relative to the frequency. If there were a second siren at your location, an
oscillation would develop between both sounds (just like when two instruments are out of
tune).
Chorus also splits the signal into at least two: a direct sound and an effects part, whereby
we have multiple effects parts in CORVEX.
The Doppler effect is created by a short signal delay from the effect. For most equipment
this delay is within the range of 10-30 ms (as in this one), this means that it is short enough
to be perceived as an "echo". The times would also be similarly short if you were to double
a guitar track for instance. A short delay in the mix already sounds "doubled" but is not
authentic. This is where the above-mentioned "out-of-tune" effect comes in: the pitch of
the effect signal is slightly modulated by gently "drifting" forward and backward in the delay
curve. The result is a floating effect where the speed is influenced by drifting.
The "Flange" effect is similar to that of the chorus, but does have a different technical and
historical background. It came about by chance: Someone (various sources say John
Lennon) slowed down one of two running interconnected tape machines in a studio with
his hand. The result, a rather brief delay of the second signal compared to the first, brought
about cancellations within the frequency spectrum, leading to a so-called comb filter effect
(the sum of both signals creates "peaks" and "dips" in the spectrum that look familiar to the
teeth of a comb).
Flanging is basically a chorus effect which however has a low delay time (less than 10 ms).
'Release' or doubling of signals is not at the fore in this case; resulting in a far more creative
deformation of the frequency response.