Bumping for some questions and new info.
I had access to a Pig built this year and had a question. Turret Board's schematic shows a 22nf going from Q4's source to Lug 3 of the Gain control. In the version I have, the 22nf seems to go from the drain to Lug 3 of the Volume control while there's an added 22uf to ground from Q4's source (in parallel with R19). I may very well be wrong, so please correct me if I am. Also the following changes were noted...
C13 - Omitted
R2 - 33k
R5 - 27k
R15 - 33k
R18 - 33k
R21 - 33k
R25 - 33k
R27 - 10k
100k trimmer replaced with a 22k resistor.
I like this pedal a lot. Personally I would drop the value of the Gain pot from 1M to 500k and spread the range. The Gain seems to reach max around noon and there are some great lesser gain shades to be had before noon that are easy to pass by. Hope this info helps.