The one that started it all, the Digitech Whammy WH-1's two octave up/down Whammy option, detune section and Harmony octave capability made it an instant classic amongst experimental guitarists. Used by the likes of Tom Morello, Jack White and Joe Satriani for the pedal's responsive shifting power, the WH-1 is a holy grail pedal of the '90s and a crown jewel in any collection.