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CHORUS, PHASE SHIFTER, FLANGER (VERY SHORT DELAYS THAT ARE MODULATING)


When a delay is very short (5/100 of a second or shorter), the delayed sound will overlap the original sound so closely that the sound waves will create hollow effect as parts of the delayed sound is out of phase with the original.  If this delay time is changed very slightly (so it occurs slightly earlier or later due to being slightly faster or slower), the hollow sound will shift in tone. 

Chorus, Phase Shifter and Flanger are short delays that modulate at different speeds (it goes faster then slower then repeats the cycle) (etc).  In other words the delay is actually a RANGE (ex: between 10/1000 of a second and 25/1000 of a second).  The actual delay time cycles up and down within this range, and the changing delay time causes changing phase effects when the delay interacts with the original.  The effect can be springy and bouncy (Flanger), watery (Chorus) or nasal-curling (Phase Shifter).  Some well known uses of a Flanger include the beginning of the song “Barracuda” by the band Heart and the breaks from Van Halen’s “The Cradle will Rock”.