Halp! Attempted to run the HD500 in 4CM with my 5150II. Managed to sort out using the mixer to drop the volume to match the preamp, but whenever I change patches there is an obnoxious loud pop. I'm sure there's a setting somewhere that solves this, but damned if I can find any useful information on it. Any of you running 4CM with a Peavey 5150 and having it work properly want to shell out some advice?
I'm not sure how to solve it, but I do know that in the last FW update Line6 claimed to solve this 'popping' issue. But Im assuming you have the latest FW anyway.
I often get this popping thing aswell, but Im just running the POD FRFR, happens often when switching from the tuner back to the patch. Scares me everytime!
Sorry that my answer isnt very helpful, just wanted to let you know that those who are not using 4CM suffer the same 'popping' problem, you're not alone!