My A string on my Fender Jazz bass sounds like it is under a chorus effect! When I first got my Jazz bass, I bought it new, and it was strung with the stock strings (gauges .45 .65 .80 .100). Eventually, I had it strung up with Ernie Ball Cobalt Slinkys (.45 .65 .85 .105) and the A string sounded as if I was running my bass with a little bit of chorus, but I have absolutely no chorus effects! Just a small practice amp! But I do not think it was just that set of strings. I strung up the bass with Rotosound RS66LD strings (.45 .65 .80 .105) recently, and it does not sound quite as chorusy as the Cobalts but it does have a sort of chorus effect going on. It actually sounds more like a piano to my ears. What is it on my bass that causes this? I never changed the hardware or the pickups (although I have raised/lowered the neck pickup before).