I have been having this problem for a little while and have seen that a few other people have had it as well. My GK800 seems to sometimes produce a crackling noise when i play or not work at all when i first turn it on (its SS). I followed someone elses advice and plugged a cord into the effects loop and just ran it right back to the loop and it completely eliminated all of my problems. It seems like it would be a decent amoutn of money to have it fixed but it doesnt seem like it thats big of a deal right now. What exactly is going on with this thing and is it a bad idea to do the effects loop trick. I would probably have it fixed if i was gigging as much as i used to or if i wasnt planning on getting a new pre-amp/power-amp setup soon anyway.