Just finished the Doom Prophet project; I added two order switchers and a wet/dry blend. The first order switcher goes either boost into wet/dry blend circuit or vice versa, while the second order switcher is connected to the send/return of the blend and switches the order of the two dirt circuits. Lots of different sounds available. I called it the Rat Pi v.3.0 because I have made two previous versions of a rat and a muff in the same box, the second of which involved putting an Afterblaster on the muff circuit, all before Barry gave us this lovely board. This is my favorite of the three.