I searched for it but no dedicated post was made on this effect pedal. There is one on the 'Probe series' but all probe pedals are discussed there.
I got one in for some TLC and to add a LED. The owner makes a lot of nice noise music but in the wash of his playing he couldn't hear if the pedal was on or off. I added an LED to the pedal (and a DC jack / he just cut a hole in the side to get a wire in)
You can find pics and a schematic in my blog; check the link in my sig.
I traced the pedal;