When I play it acoustically, there's nothing wrong. Let me point that out first. BUT, when I play it through my amp the D string barely gets amplified, if at all. I don't know what to do about it, and I'm wondering what could be the problem: The bridge? The string? The electronics? I have no idea what it could be, and I need to use it for the musical that a couple of my teachers are writing. Actually, the title of the musical is The Whereabouts of Wally Dudes, so from now on if I mention The Whereabouts of Wally Dudes that's what I'm referring to. Anyway, I know that it can't be the battery for several reasons: 1) When I press the battery check button, the red LED lights up 2) I've checked the battery with a battery tester 3) If it WAS the battery, then why do the other 3 strings sound perfectly fine through my amp? So if anyone knows, or thinks they know what it is, could you let me know please? Thanks.