The stereo chorus in the Classic Keys is
very similar to the stereo flanger except
that the delay time is longer. The delay
times for the stereo chorus range from 13
milliseconds to 52 milliseconds, com-
pared with the 26 microsecond to 6.5
millisecond range of the flanger.
FXA:StereoChorus
LFO Rate 050
FXA:StereoChorus
LFO Depth 050
FXA:StereoChorus
Min Delay 036
FXA:StereoChorus
Feedback +100
STEREO FLANGER
A flanger consists of a short audio delay
line whose output is mixed together with
the original signal. Mixing the delayed
and original signals together results in
multiple frequency cancellations creating
a comb filter effect as shown in the
diagram below. Since the flanger is a type
of filter, it works best with harmonically
rich sounds such as strings.
The flanging effect was originally created
using two tape recorders playing identical
recordings. By exactly synchronizing the
two decks and then slowing the speed of
one by grasping the tape reel flanges, the
flanging effect was born.
The flanger in the Classic Keys is a stereo
device consisting of two separate delay
lines controlled by a single set of con-
trols. The block diagram of the flanger is
shown on the following page.
Adding the original signal together with a slightly delayed version creates multiple cancellations in the
output signal called “comb filtering”.
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