Forgot to mention I also build the Panspermia using a kit from Musikding with these corrections, and there are no problems with it, you can have sustain pot low and unity gain isn't at 3 o'clock-ish or whatever.
Actually, there is errors in the original schematic drawing that was never corrected, it was traced at the freestompboxes.org forums, if you go through the thread you can see photos of the board, what is mentioned as missing and/or incorrect...