I am selling my DRV that is a special holiday edition. I believe that the circuit is a little different but I cannot find the information on the web to describe it. here is how the email described this variation:

"I'm doing a few interesting things with the circuit, including a warm white LED (clipping), which will be visible on the bottom edges of the pedal, flickering as you play. This also has a much cleaner sound, and very nicely LOUD."

I have left the pedal unopened and have never even pulled it out of the plastic.