Samaba, adjusting the preamp channel controls is really just a balancing act (no pun intended) but it doesn't solve your problem, it only allows you to turn the volume contol further to the right because you decreased the signals to the channels. I hope I am wrong, but I think it is going to happen again, except maybe this time it will be when your volume control may be at 1/6. Just for the hell of it, check to make sure all of your cable connections are secure.
