I think we need Stan's input here, when he's next around. The "gain mod" on mine (original Gator) completely cured the problem, whereas before it was exactly as Gaz describes, especially piano. It made no difference if I used the variable output set very low, and the amp set high. Gaz - which input are you using on your amp - some have different sensitivity (mine doesn't) on the CD input, which is what I believe the Gator is designed to work with, I understand.