No gain control, the buffer is a fixed 3:1 gain. That's where all the testing has been, and trying to make sure nothing bad happens at all gains on all layouts would be a lot of testing. Dale did a lot of work on the design and tested it in a number of locations. Unless someone comes up with a good reason to change it, I'm sticking with his basic design. We added some monitoring and tweaks, but the basic design is all Dale.
There's always version 2 if there's a reason, but I think just getting the signal there is the key requirement.