Just got my new HELIX and I'm loving it. One issue I'm having trouble with is figuring out how assign my reverb's mix parameter to the expression pedal. I play at my church and love the idea of being able to increase and decrease reverb mix quickly and easily without having to bend over and tweak my boss rv-5 like I've been doing. The issue seems to be that when I go into command center and assign the mix control to the expression pedal, the pedal will not only control the mix, but also the decay. Somehow both parameters are assigned to the controller. While it makes sense to pair these 2, I'd like to keep my decay long and just bring the mix down. Is this possible?