From the very beginning, the RAT was destined to define "The Sound of the Underground." It was, after all, born underground in the cavernous basement of the Pro Co Sound factory in downtown Kalamazoo, Michigan. From these humble origins, the RAT has evolved from a single, hand built prototype into a family of the most versatile and most recorded distortion pedals in the world. Do you want to see how the RAT has evolved? The RAT Family Timeline details the expansion of the RAT product line throughout the years. Also, since there is no accurate way of dating a RAT pedal by its serial number alone, this timeline can help you determine the general age your pedal.