There's basically 2 loops, with a volume pedal in between, that way the 1st loop sees a full consistent signal, and the 2nd loop is dynamic based on the volume pedal.
GTR> Waldo Buffer > Loop 1 > Visual Volume > Loop 2
I'll be adding a POG to replace my OC-2. Also adding a second OD to stack after the Earth Drive but before the Comp, and Delay is last . That will be it for analog pedals, and then I'm going to throw an M9 with dual exp pedals on my pedaltrain for another separate loop, it will be the perfect size.
Any suggestions for a 2nd low-gain OD? I was thinking a Timmy, or a MP Sweet Honey. Any non-Jer recommendations that you guys think will work well with these type of rigs?
Usaully my iPhone takes sweet pics, but these came out pretty bad for whatever reason.
). I can tell you that but I know, you won't believe it unless you hear it for yourself. So borrow one, dime the volume, bring the distortion up to just above unity, set the filter to balance out the overall EQ from how the pedal interacts with your rig, and you'll enjoy what you'll hear. 
Oh, and there's several good low-gain Rat demos on YouTube.
