The T-Rex Dr.Swamp is a double distortion pedal.
It has that rich vintage sound, T-Rex is known for.
Besides the warm crunchy sound, this pedal gives a lot of steady bottom.
You can flip back and forth between the two gain settings A and B - by
clicking switch A or B. The lid (A or B) is indicating the active gain.
The pedal is turned off, by clicking the switch (A or B) that is .