Can anyone comment on their experiences using the effects loop on the MK II C+. I've tried running a simple Ibanez eq pedal thru it (once when i bought it a few years ago, and again yesterday) and it just doesn't produce a good sound. Seems more bassy and to make the amp rattle a bit? Could this be a tech. problem or is that just the way it goes with that amp? Seems hard to believe that the latter would be the case. thnx.