Flanger is a delay modulation effect, similar to Chorus, with different delay times of the copies it creates and with feedback in the signal path. It can be used to create more drastic, resonant and metallic sounds.
Choose the number of delayed copies of the audio signal used for the effect.
Set the delay time of the voices (copies).
Set the frequency of the LFO. Higher frequencies means faster modulation.
Set the amount of modulation added to the incoming audio signal.
A highpass filter added to the effected signal.
Set the mix between the original and effected signal.