Chapter 3 - Overview

Quad Chorus

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 ÒrhythmÓ 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 Òjet airplaneÓ-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, ÒFlangingÓ 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 ÒFlangingÓ 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 ÒswishingÓ or ÒtunnelingÓ sound.

 

 

 

 

LFO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DRY

 

 

 

DELAY

 

 

 

 

FLANGED

 

 

 

 

 

 

 

 

 

 

 

 

 

FEEDBACK

 

 

 

SIGNAL

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DRY SIGNAL

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. The Feedback parameter (Parameter mode, Page 1) of all four Flanger effects (Mono Flanging, Stereo Flanging, Mono Trigger Flange and Stereo Trig. Flange) may be set to negative values as well as positive. Negative values results in the signal being fed back to be out of phase, creating a more hollow sound. The value range goes from -99 to 0 to +99.

40

Q20 Reference Manual