The Flanger effect is a guitar effect that distorts the sound by playing back a copy of the original signal with a delay. The copy is changed by means of modulation, so that the sound is distorted in a characteristic way.   
The following setting options are available in the Modulation area:
Slider
Depth

Modifies the copied signal and specifies the degree of the change in pitch.

Slider
Frequency

Modifies the copied signal and specifies the frequency of the change in pitch.

The following setting options are available in the Mix area:
Slider
Dry Signal

Mixes the original signal with the copied signal, indicating the intensity of the original signal.

Slider
Effect

Mixes the original signal with the copied signal, indicating the intensity of the copied signal.

Check box
Stereo Flanger

Gives the processed part of the audio file a more “stereo-like” sound.

 
Frequency
The frequency denotes the oscillations per second of an electrical or magnetic field. With audio files this means that the frequency increases with rising pitch. The unit is Hertz (Hz). The highest magnitude of oscillation is called the amplitude.


Flanger