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Flanging is a classic audio phasing effect which generates a swirling frequency (moving comb filter) effect. Flanging is produced by mixing the input single with a delayed copy of itself where the delay time is continuously varied at a low frequency. The Flanger algorithm supports growing by one to support stereo processing.
Flanging is typically used for guitar but can be utilized as a special vocal effect.
Controls:
Algorithm:
Flanger utilizes an FIR comb filter with a short delay time (typically <15ms). The delay time is continuously modulated by a low-frequency-oscillator creating the characteristic flanging sound when the filter notches sweep up and down the in frequency over time.
Example:
The following example shows a stereo Flange effect using a 2 input Flanger and Volume Control.