The T-Rex Engineering Gristle King Effects Pedal was developed especially for Greg Koch. The Gristle King offers you a wide variety of boost and overdrive possibilities. The Gristle, Tone, Gravy and Flavour controls and 2 toggles dial in just the tone you're looking for. The T-Rex Gristle King pedal gives you 2 effects, plus extra tonal possibilities, in one compact stompbox.