A phaser or phase shifter creates a slight rippling effect—amplifying some aspects of the tone while diminishing others—by splitting an audio signal in two and altering the phase of one portion. Three well-known examples of phaser are the two handed tapping part on the Van Halen instrumental Eruption and the keyboard parts on Billy Joels Just the Way You Are and Paul Simons Slip Slidin Away.
Phaser
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