Hello. I posted on this before once, but I think I may have found the root cause of a very troubling problem. I was gettting a horrible clangy distortion sound with my combo on the "modern" channel. I tried new tubes, took it to a tech twice, ect. Finally I discovered something when I messed with the effects loop. When I plugged a cable into the send and return and turned the knobs all the way up, the modern channel sounded good again. The only problem is the master volume really explodes when you try to turn it up now. When the cable is removed from the loop... clangy tone again... ANy ideas???