Suddenly one day, my Delays and Reverbs and any effect I place post FX Loop no longer work. The buttons respond, but the audio is not changed. If I move the effect block before the FX Loop, it makes some audible change but is quite lollipop. I am using the 4CM and it was working, and now isn't. Is there a setting I may have accidentally changed or has anyone else has this problem? Thanks, Greg.