Flanger

Applies Flanging effect to the selected part of an audio file.

Parameter	Description
Delay Rate	Rate of delay. Varies from 0 (there isn't delay) to 100 (delay is 20 ms).
Mix Depth	The dry is the volume of the input signal and the wet is the volume of the delayed signal, in percent. Varies from 0 to 100. If Mix Depth = 0 result signal isn't contain delayed signal. If Mix Depth = 100 result signal isn't contain input signal. Other values of Mix Depth are combination of the dry and the wet (wet = 100 - dry).
Feed Back Gain	Feed Back Gain sets how much delay is feed back to the input. Varies from 0 to 100.
Sweep Depth	The sweep depth determines how wide the sweep is in terms of delay time, in percent. Varies from 0 (no effect) to 100 (maximal effect).
Sweep Rate	This parameter refers to the frequency of flanging. Varies from 0 to 100, in percent.
Sweep Phase	Phase of delay, in radian.

Tip:

See also: Apply a Special Effect or Filter
Flanging is created by mixing a signal with a slightly delayed copy of itself, where the length of the delay is constantly changing. It is actually one specific type of phasing (Phaser).
For more information about flanging effect see: http://www.harmony-central.com/Effects/Articles/Flanging