Quad Chorus; Mono Flanging; Stereo Flanging - Alesis 2 Reference Manual

Quad Chorus modulates four delayed signals, each with its phase offset by 90 . Each
of the four signals has a separate Predelay parameter, allowing you to change the
"rhythm" of the phasing.

Mono Flanging

Flanging is similar to chorusing , but modulates the delayed signal over a much
shorter delay range (typically 0-12ms). This produces a "jet airplane"-like sound.
Mono and stereo flanging is available, and the flange modulation sweep can be
triggered in order to sync up with the rhythm of your playing.
First used in the 1960s, "Flanging" was achieved by the use of two tape recorders
that would record and play back the same program in synchronization. By slowing
down one tape machine, and then letting it catch up with the other, different phase
cancellations would occur at different frequencies. Since the slowing down of the
tape machines was done by hand pressure against the flanges of the tape supply
reels, the term "Flanging" came into being.
The effect of Flanging is achieved by splitting and slightly delaying one part of the
signal, then varying the time delay with an LFO. The delayed signal is then mixed with
the original sound to produce the "swishing" or "tunneling" sound.
Many parameters are available, from varying the speed and depth of the LFO to
feeding back part of the signal to make the effect stronger.

Stereo Flanging

In the case of the Stereo Flange, the signal is split into three parts with a dry signal
and a separate Delay section for both left and right channels with one channel
flanging up while the other channel flanges down. Once again, this causes the effect
to become more pronounced and dramatic.
Phasor
Another popular effect is the Phasor or Phase Shifter. Although similar to flanging ,
this effect is produced differently. Again, part of the signal is split from the original
QuadraVerb 2 Reference Manual
DRY
SIGNAL
DRY
SIGNAL
LFO
DELAY
FEEDBACK
DRY SIGNAL
DRY SIGNAL
FEEDBACK
DELAY
LFO
DELAY
FEEDBACK
DRY SIGNAL
Overview - Chapter 3
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