Hey guys, Yesterday I went and bought a 1978 Jazz Bass. It is unreal to play and I fell in love with it straight away. The bass is fitted with a pair of SD basslines (unsure of the model) and they are covered in rust. I was told not to worry about it because it wont affect the sound. So I was slapping away through my GK 700rb head, GK 4x10 and GK 1x15, and the second I slapped the open E string... BLLAWWWWWWWWWWWWHHNNNGGG. An overamped sounding, distorted E. At first I thought that it was physically smacking on the pickup, but after watching it, it isn't at all. All the other strings are fine, just that old E string. What could it be? I have never had experiences with SD pickups before, only EMG. Could this be a rust problem?