Yes, I built the bidules from your pics, these are the ones I have been trying to use. Good to know they work reliably for you and are the basis for the zmeter. That means it's probably user error on my end. Something needs to click and it has not for me. I tried a few mods, tried inserting sample and hold for "windowing" with a trigger clock, things like this. maybe trying again with the line function (slope and y-intercept) will help clear things up. For example, how could any of these be used in an auto gain control setup, param linked to sliders so the sliders move when gain control takes over? i'm still chasing the automation with the pluggo feedback network's gain control, or imagine the behringer bcf2000's sliders automated to control feedback. possible?