Hey all, I've rack mounted (or rack drawered my pedals) and finally got my Voodoolab GCX and Ground Control rig to switch channels on the E530. I am powering with a well preserved Peavey Classic 50/50 tube power amp. The Ground control commands the GCX which switches pedal effects in my rack and also switches channels and gain on the E530. It all tested out okay at home, but taking this to rehearsal I am having a horrible amount of "helicopter noise" on high gain settings. I am running out of ideas, everything is connected the same. We rehearse in an old building with spotty electricity, so that's a given. I have a power strip feeding this rack. I am starting to think maybe tubes on the preamp are getting microphonic as positioning the whole rig seems to get affected. The power amp is fine, that was used before and didn't exhibit any weirdness. There is a noise gate on the input but it doesn't seem to be doing much.