Many say the Phat Mod delivers their favorite tone from a pedal. It s that natural break-up that just feels good and lets you express yourself. The dynamics make it feel alive and part of your fingers. That s the reason the modified pedal has stayed on people s boards for nearly 15 years. The Keeley Super Phat Mod is their famous mod now perfected with amazing sounding JFETs that emulate old tube amps in a unique way.The Super Phat Mod pedal now has incredible dynamics.