Alesis Musical Instrument MICROVERB 4 User Manual

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Overview of Effects – Chapter 3
MicroVerb 4 Reference Manual 25
This is a less processor intensive version of the Stereo Chorus, used in Multi Effect
configurations. The effect of Chorusing 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 back with the original sound to produce a thicker, warmer sound.
Stereo Flange
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.
Flanging is similar to chorusing , but modulates the delayed signal over a much
shorter delay range (typically 0-12 ms). This produces a “jet airplane”-like sound. The
flange modulation sweep can be triggered by the audio input (either the left or right
input, or both), in order to sync up with the rhythm of your playing.
In the case of the Stereo Flange, the signal is split into four parts with a stereo 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. True Stereo Flanges have individual
LFOs controlling the Left and Right sides for a wider stereo image.
Some of the Flange Programs reset their LFO every time the input level passes a set
threshold. These are called Triggered Flanges, and are useful for sweeping effects
that move in time with the music or part. If the flange is retriggered in the middle of its
sweep, this may cause a thumping or popping effect. This is not a malfunction of the
MicroVerb 4. If you set the input volume properly ( retriggering will occur when the
input signal crosses -6dBv on the input meters), the flanger will only retrigger for
attacks and produce a smooth, sweeping sound.
LFO
DELAY
DRY
S
IGNAL
RIGHT
FLANGED
OUTPUT
FEEDBACK
DELAY
FEEDBACK
DRY SIGNAL
DRY SIGNAL
LEFT
FLANGED
OUTPUT
Auto Pan
The Auto Pan effect alternates the loudness of the signal in opposite channels at a
definable rate. This effect may be triggered by the input signal (either the left or right
input, or both). It can also be used for Tremolo effects, creating a fast panning effect
for surf guitar. Edit A controls the speed of the panning effect and Edit B controls the
width of the pan. When using the Auto Pan effect, the MicroVerb 4 should have its
effects mix 100% wet with no direct signal mixed in to avoid phase problems.
Chorus/Flange Parameters

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