This is based on the famouse'Rat'(TM), but with many popular modifications, including a toggle for three different clipping options, a texture knob (an expanded version of the 'Ruetz Mod') which reduces the gain to milder overdrive levels and a clean signal blend control. The clean signal blend is particularly usefull for jazz players as it preserves articulation and the original guitar tone, as well as making it easier to control the combination of hi-gain and semi acoustic guitars. If you've ever tried to play an archtop guitar with a distortion pedal you'll know what I mean.
It's also a great distortion/overdrive choice for bassists.
The one pictured is a custom build, but contact me to discuss options and pricing.