I have a 1981 Aria Pro II SB-1000. It's a beautiful bass to play, but has a pulsing noise it the background that renders it useless for recording. The noise seems to be being caused by the pulsing LED that comes on when you plug in the bass. The noise is present whether the active selector is on or off, but is worse when on. I was wondering if this is a common problem on this bass, or if anyone has a cure. I'm happy to disconnect the LED, but I'm worried that it might cause more problems than it solves. Also, it seems unlikely to be a design problem as it makes such an obvious noise.