22
CHORUS AND FLANGE
Both choruses and flangers use a Low Frequency Oscillator (LFO) to
produce their rich, swirling effects. When you change the speed and
depth Parameters of modulation effects, you're actually controlling the
frequency and amplitude of the LFO. These settings determine the
rate and intensity of the modulation effect.
In general, here's how choruses and flangers work: after entering the
Module, the source signal is split into two paths. One is allowed to
pass through the Module unaltered, while the other is delayed and
pitch modulated. The modified sound is then sent to the output, along
with the original. In Fig. 3-3 below, a sine wave is used to modulate
the pitch of the split sound source.
Figure 3-3 Modulation Example
The Dual Chorus creates two different pitch “voices”, while the Octal
Chorus creates eight voices for extremely full, rich sounds.
The only difference between choruses and flangers is that flangers
use less delay and have a feedback Parameter that sends a portion of
the effected signal back to the input of the Module. When the effected
signal reaches the input, it is sent through the Module again, building
thickness and depth. If you increase the feedback enough, the source
begins to lose its own original pitch to the dramatic pitch modulation
of the feedback loop.
LFO Waveforms:
There are four LFO waveforms available for
Choruses, Flangers, Phasers, Tremolos, Auto Panners, and five for
Modifier LFOs. They include SINe, TRIangle, SPecial-1, SPecial-2, and
SPecial-3. See figure 3-4 on the following Page for examples of what
these waveforms look like.
PITCH
T I M E
-5 cents
0
5 cents
10
10
1 sec
2 sec
3 sec
Modulated Sound
Original Sound
Section 3 - Effects and Parameters
Studio Quad Owner's Manual
