A flanger works by mixing two identical audio signals together, with one of the signals playing at a slightly slower speed. This creates the effect of two tape recordings playing simultaneously, but with one tape player going slightly slower than the other.

What is flanging in audio?

Flanging /ˈflændʒɪŋ/ is an audio effect produced by mixing two identical signals together, one signal delayed by a small and gradually changing period, usually smaller than 20 milliseconds. ... The phase of the fed-back signal is sometimes inverted, producing another variation on the flanger sound.

What does a phaser do?

What does a phaser do? A phaser creates cuts in the high end of a signal with the placement of those cuts being modulated up and down to different places on the audio spectrum. This behaves like an automatically moving tone control, but only on a small group of frequencies.