From Freakshow:  About the Janky Drive
"The Janky Drive is my take on the Hermida Audio "Zendrive" overdrive pedal. I took the original circuit and changed up the diode clipping section as well as the particular op-amp used as the heart n soul of this design. How does it sound? It sounds just like the Zendrive does....only just a tad bit more gain on tap.

I have confirmed with a friend who owns an original early production Zendrive that the Janky Drive does match tone very closely. The only knobs that required a slightly different setting than his original were the Volume and Gain knobs."