Keeley Katana Boost Katana Clean Boost Along with the Tube Screamer, this is a guitar effects pedal that is essential for the John Mayer sound, as everyone knows. This is a valuable, older version of the effect pedal that has rarely been removed from John Mayer's effects board throughout his long career. While many clone effects pedals are sold for the Marshall Blues Breaker, Klon Centaur, and Ibanez TS10, there are no clones for the Katana Boost, so you absolutely need the original to get that sound. As a fan myself, I've purchased almost all JM-related effects pedals at least once, but the only ones still on my board are the Katana Boost and the Way Huge Aqua-Puss delay. I love the Katana very much and own two, but I am selling one of them this time. The included items are all shown in the photos. To prevent replacement, returns are not accepted, and no claims or returns are allowed.