Howdy folks. I just did the 10kc mod on my 959 and now have to run the mic gain halfway when the amp is on or it squeals. The switch works, center=normal, left=10k down but right should be 10k up and does nothing i.e. normal channels. Do you think I screwed up the mod, should take it out, try another switch or posibley the location of the sw? Put it above the final between final and echo knob. Maybe its causeing interference. I don't know. Any help will be appreciated. 73s