DOD's FX69B replaced the FX69 in their lineup in '98, providing an updated circuit and redesigned chassis. The Grunge FX69B is a super high-gain preamp that provides heavy, screaming distortion and can be shaped using four clear-cut controls: Loud, Low, High, and Grunge. It's intuitive, it's grungy, the DOD Grunge FX69B will give you hyper-distorted sounds.