What is a flanger?

A flanger is an audio effect used in music production and sound design that creates a unique sweeping or swirling sound. It is often applied to guitars, vocals, synthesizers, and other instruments to add depth and texture to the audio.

The flanger effect is achieved by mixing together two identical audio signals, with one of them slightly delayed and modulated in time. It creates variations in phase and frequency, which result in a distinctive sweeping sound. The delayed signal is typically modulated by a low-frequency oscillator (LFO), which controls the speed and depth of the modulation.

The name "flanger" comes from the original technique that used two synchronized tape machines playing the same audio source. By slightly pressing a finger on the flange of one of the tape reels, the delay and modulation effect was created.

Flangers can produce a wide range of sounds, from subtle and gentle modulation to extreme, metallic sweeps. The intensity of the effect can be adjusted to suit the desired sound. It can be used to add movement and richness to a track, reminiscent of jet planes passing by or a swirling, psychedelic atmosphere.

In addition to music production, flangers are often used in film and television post-production to create special effects, such as simulating a time travel or dreamy sequences.

Flanger pedals and plugins are commonly used in live performances and studio recordings. They provide various controls to shape the flanging effect, including depth, speed, feedback, and mix. These parameters allow musicians and sound engineers to tailor the sound to their liking and create unique sonic landscapes.