I've attemted a few things.
Attach a switch to Master in the amp...even a 4db shift offers little difference and in some cases, the amp block just goes dark when I press the button.
Add a volume block, call it gain, at the end of the signal chain...Nope...that didn't seem to want to work well either..lost all the tone.
So...I know it can be done...
(Pretty sure when I get more money, I'm going to the Racked version..has a few bells and whistles I miss from Fractal..)