After having used standard Carvin strings on my LB-76 for three years, i decided to venture out. I replaced them with a set of DR's of a slightly lighter gauge. after having spent about two weeks, micro-tuning the intonation, the action and the neck relief, i have gotten the strings to be playable much like the Carvin strings were. i use a pretty low action, since i am mostly a finger-player. with that said, i DO get some string buzz when i dig in to the strings, but all in all they dont buzz. the problem is: now when i play higher up the fretboard, between the 15th and 24th frets, there seem to be multiple tones coming from the strings when i play a note. In other words, i'll play a note and it sounds like the note is being sounded with two or more dissonant notes. The higher up the fretboard i go the worse it gets; even on the 24th fret. Because it does this on the 24th fret also, i pretty much ruled out fret buzz. i have even played the note and reached up with my picking hand to the 12th fret to stop the string from vibrating between the nut and the fretted note. but i still get the strange overtones. Any thoughts?