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An effect occurring when a sound with strong formant characteristics is shifted severely in pitch using a pitch shifter, resulting in a noticeably peculiar timbre. The name comes from the canonical example of shifting the human voice upwards, resulting in an effect often compared to the Munchkin voices from the movie The Wizard of Oz.  This is also  called the "Chipmunk effect," named after Alvin and the Chipmunks.