#1
So i've got a randall RX120Rh and i'm trying to run a GNX3 effects processor through it and an EHX Metal muff. I'm mostly going to use the GNX for delay reverb chorus etc.. However i still like some of the patches on the GNX. So i ran the GNx trough the FX loop and for some reason, now only some of the patches are really loud and just generally sound horrible. Also i have to strum really hard to get any sound out at all. I'm also getting sound when the volume on the amp is completely off. I can't seem to figure out the problem.
#2
Try running it in front of the amp to see if you still have the volume issue.

Maybe some of the patches have the volume/gain turned way down?

That kind of pedal with a metal muff wouldn't sound that good anyway me thinks.

I think Digitech has a patch and forum section on their web site, you could try there.