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Stereo Flange; Chorus - YAMAHA SPX90 Operating Manual

Digital multi-effect processor.
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STEREO FLANGE

A combination of Delay and LFO (Low Frequency
Oscillation) modulation, the popular Flanging effect can
dramatically thicken the sound of keyboard in-
struments, or produce the "aircraft" sound popular
among guitarists. Basically, a short delay time is varied
with LFO modulation so that the delayed signal moves
in relation to the direct signal. The resultant variations
in pitch and stereo imaging are known as "flanging".
1. MOD FREQ. Range: 0.1 ~ 20.0 Hz
Sets the speed of modulation, and hence the rate
at which the effect varies.
2. MOD DEPTH. Range: 0 ~ 100%
This sets the amount of delay time variation, thus
adjusting the "depth" of the effect. At the max-
imum setting, the delay time is varied by +/-
4 msec.
3. MOD DELAY TIME. Range: 0.1 ~ 100 msec
This sets the basic delay time from the initial direct
sound to the flange effect. When set to lower than
1 msec, more high-frequency variation is produced,
while a setting higher than 3 msec will create more
low-frequency variation.
4. F. B. GAIN. Range: 0 ~ 99%
Sets the amount of flange signal which is fed back
into the circuit for further modulation. This controls
the complexity of the effect, its "strength," and its
overall decay time.

CHORUS

With the Chorus effect, a violin, keyboard, or guitar can
sound like an entire ensemble. Chorusing splits the in-
coming signal into three signals placed at the center,
left, and right in the stereo image. Each signal is delayed
slightly, and then its delay time and level are modulated
by the LFO (Low Frequency Oscillator).
1. MOD FREQ. Range: 0.1 ~ 20.0 Hz
Sets the delay time modulation speed (frequency).
2. DELAY MODULATION DEPTH. Range: 0 ~ 100%
This sets the amount by which the delay time of one
delay signal is varied in relation to the other. At the
maximum setting, the delay time is varied by +/-
4 msec.
3. AMPLITUDE MODULATION DEPTH. Range: 0 ~
100%
This sets the amount by which the amplitude (level)
of the input signal is varied.
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