I recently came across this comment from Bjorn on TGP, "The PGC began it's life as a two control model but today there is only one two knob PGC in existance as I pulled in the first ones made and added a tonecontrol as the initial reviews called for that."
Since I have a two knob PGC, it must be the one he references. I had no idea that I have the only one. I tried the three knob PGC and did not care for it because I could never get the "body" control where I was satisfied. I love the two knob as I just set the amount of compression I want and then volume to taste.