Hello, I bought cp4500 kit over a month ago. The build went all good. Decided to do more, wanted to buy mp512 kit but there was one build/used one eBay. Got it, and I am happy about your gear. Lately, on the mp512 I noticed when using DI, the front LED turns green and as it fades it makes audible distortion/clipping to the sound. Does not happen when using mic input. Any help would be appreciated. I am just an amateur in regards to electronics. Thank you.