I have a single channel head with an fx loop and no fx send level. I'm going to use a Rocktron Patchmate to allow me to use my Axe-Fx for fx with my head and for preamp tones. Basically the 4 cable method thing, but I'll be going through a looper. However, I've just realized that when I'm running the Axe-Fx as a preamp into my amp's power amp [via the fx return] the master volume on the amp doesn't affect the volume. So to balance volumes between the amp and preamp volumes when I change venues I'd have to adjust the output knob on the front of the Axe-Fx and the voume on the amp. Won't that change in levels screw up any patches where I'm using fx from the Axe-Fx with my head?