I have loaded the code in my pedalSHIELD DUE and it works perfectly, it is a pretty psychedelic pedal, pretty dirty, noisy as hell but has a super-cool droning effect... try changing some of the variables in the code so you can make it faster but in my opinion it is great as it is.
OK. I tried it again and got it to work. Not sure what was wrong before but on my pedal the LED doesn't turn on and off when you engage/disengage the pedal. It is randomly on and blinks when setting are a certain way.
It is crazy loud too when on, way louder than the bypassed signal.