I might check into one of those boxes. The noise usually isn't that bad for me, Maybe I'm just use to it. LOL! There are times when the hum seems more present.
So when you are in 4cm, how do you add the preamp models of the Axe? If I run the amp block(poweramp sim off) in front of the effects loop block in my preset chain, doesn't that feed into the input of my Mod50?
It depends on your routing. I have a trick routing setup with some panning and the feedback blocks so that I use the fxl block to do both the Amp input feed and the fx return with fxl leaving out1 for something else like a wet feed or whatever.
The easier thing is probably to just put the fxl block in the patch to send to and return from the modular preamp and then use out1 to feed the fx return. You have to route it so you enable an Amp block while muting the fxl block and vice versa.