Topic summary
Guitar pedals
Extracted from the Wikipedia article Effects unit.
Pitch and frequency
The first mass-market digital pitch shifter was the DigiTech Whammy, introduced in 1989. It creates a "strange and artificial" sound, with distinctive "wobbly" artifacts. Its users include Jonny Greenwood and Ed O'Brien of Radiohead, Matt Bellamy of Muse, Tom Morello of Rage Against the Machine and Audioslave, David Gilmour of Pink Floyd and Jack White of the White Stripes. Guitar World described the Whammy as one of the most iconic guitar pedals.