Has anyone used the 500X in conjunction with a rack POD or the M13/9? I'm running into my processing limit and would really like access to some of the nicer filter and modulation effects. I've got a standard 500 and an X3 but not really enough floor space. I was thinking about putting an HD Pro in a rack to be controlled remotely or maybe an M9 on the floor (since it's small). Thoughts?