For the past couple of weeks I've noticed a crackle coming from my GK 700RB 210. It sounds like it's not liking any volume levels below a certain level. When I hit my strings softly the amp starts sounding as though it were clipping. A few weeks ago it was not very noticable (you'd have to play very soft and you'd get it but as soon as you opened up and started plucking hard you wouldn't get it). Now this week I was playing. When I plucked normally I got this crackle (but again when I started to pluck hard it would go away). I was talking to an amp tech and he said it doesn't sound like anything normal. I'm thinking of bringing it in soon. Would anyone have an idea what this could be? The only thing I think it could be is the outlet that the amp is plugged into is not supplying enough current.