Hi all, I purchased a brand new SC20H recently, and ultimately, the amp rules. The tone is everything I've ever looked for. Classic 80's Zakk Wylde tone when boosted with an SD-1. I love it. HOWEVER, there seems to be some FX loop issues, and five minutes of research was enough to verify that I'm sadly not alone on this matter. It appears the SC20H is notorious for FX loop flaws. Volume drop and true bypass-pedal popping are seemingly common issues. I'm having another issue which I haven't come across anywhere as of yet. My FX loop is noisy. Very noisy. When the loop is disengaged, the amp works perfectly. Once the loop is on however, a loud hum kicks in (regardless of whether any pedal is on or not). I mostly only use a BOSS DD-3 in the loop. And I've tried moving the pedal several feet from the amp to no avail. I'm just wondering whether this is commonplace for these heads and I just suck it up for the sake of the awesome tone. Although having a noisy loop is a total pain in the ass as delay in the loop is critical for my playing style. I emailed Marshall and they described it as abnormal. They suggest I send it back to the place of purchase, which is 1800km's, so I'm reluctant, in the case that they just confirm its not a faulty device just a faulty design and I'm without the amp for weeks. Some advice would be wonderful! Thanks.