Anyone who has ever played a new set of spiros will immediately know the sound I mean. On the G string, somewhere up between the D and the 8ve G. It's kind of a whiny, nasal, metallic "boing-y" kind of thing that happens until the string gets played in for a year or two. What, physically/technically/structurally, is that sound? What makes it happen? What produces that sonic phenomena? Currently have a set of 3885 Spiros on the travel bass, and the whole thing sounds beautiful, but the G is doing that spiro thing in the D-Eb-E range, and a little bit still on the F. I keep telling myself that if I just play it enough (I'm doing my calibration thing on it for 40 minutes a day), it will eventually chill out. On the other hand, dry as my skin is, maybe my best bet is to loan the bass out to acidic skinned players for a while and hope they can kill it a little bit? I don't know. Of course I'll just keep playing it until it chills, but it has me wondering what makes these strings do that thing?