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A member of CHON wrote in their second reddit AMA that Erick uses this pedal. You can hear it in effect in the studio version of the song "Book" as well as in some live shows, such as https://www.youtube.com/watch?v=kabrEkr8quo at 9:19, where you can also see Erick stepping on the pedal (which is out of sight) to activate it. The effect is more easily heard at 9:26 in the video.more