Seriously, it is Rat!!! it is probably one of the greatest distortion pedals ever made. So many other distortion pedals have been based on this circuit. Hell there’s compression pedals with Rat circuits in them. It is really easy to use, and in my opinion sounds way better than a Boss DS1, and I am not pooping on a DS1 in anyway. The filter knob allows you to go from bright and cutting to dark and moody. You’ll be able to find your distortion sound with this pedal. You have also heard this pedal on so many record recordings, whether you realize it or not. If you’re looking for a good first distortion pedal or you need a workhorse this will work for you. Buy one and buy one from DeathCloud