Phaser (effect)

Phaser on strings synth

A short, unprocessed string sample, followed by a few different phasing effects on the same sample

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Phaser on drums

A short, unprocessed drum sample, followed by the same sample with a slow phasing effect

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phaser on distorted guitar

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A phaser is an electronic sound processor used to filter a signal by creating a series of peaks and troughs in the frequency spectrum. The position of the peaks and troughs of the waveform being affected is typically modulated by an internal low-frequency oscillator so that they vary over time, creating a sweeping effect.

Phasers are often used to give a "synthesized" or electronic effect to natural sounds, such as human speech.