Gig tonight, so I wound on a new set of Rotosound RS 66LB's. This is the first "new" set of strings I've had on this beater SX Jbass. The G string sound horrible! Weird harmonic/overtones...I didn't know what was wrong. I'd taken off the original set of strings the bass came with and put on a mildly used set of RS 66LB's, so the gauge shouldn't have been a factor. I worked for about a half an hour on setup to no avail. Soooooo...I yanked off the new G string and wound on the used G string. It sounded fine. What in the Sam Hill is going on??? Anyone have a clue?