Hi i registered here, i thought you could help me out. I am from germany, so my english could be a little bit weird. MY JMP1 OD2 Channel has issues since today. If i turn up the gain theres a loud pheep, screaming noise to hear, but on gain stage 20, 15, 10, 5, 0 there is no pheeping noise. In Area 10-15 the noise changes little bit in the tone height.. There must be a logical issue, but i cant detect it on my own. Whats wrong here? That amp is modded after the french jmp1 article. Thank you .