Hi JohnOG,
You can probably guess who I am and I also use that method mentioned on the "other" forum by Ross..
It works great and the FOH has a constant level from me for every gig - no messing about with mic placement, worrying about knocking said mic, bleed etc etc - it's been a total revelation for me and soundman!!!
I now have the freedom to control my own on stage volume for my personal monitoring through the master volume of my amp without affecting FOH - have to be careful obviously that my on stage isn't drowning the FOH but no complaints so far - in fact, the rest of the band have asked if I can turn up a bit on stage - win, win!!!!
It also means that I can still run the modelled preamps for the times when I don't want the "real" preamp for different tones (Vox sounds mainly).
This feature alone IMO sets the Helix apart from the Fr@ct@l units and just shows how much thought went into this product!!