Phaser — is a modulation effect that shifts the phase of certain frequencies in a sound and blends them back with the original signal. These phase shifts create a distinctive “sweeping wave” or “rotating” sound.

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It often sounds like bubbly, spacey whooshes.

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Fun fact:

The first phasers were created back in the 1960s to mimic a “flying” or swirling sound — inspired by NASA’s space missions.