Re: 1st string problem
Try loosening your truss rod. When a truss rod is tightened beyond necessary, it starts affecting the side of the fretboard where the high strings are first.
Now the edit part:
What I've written above goes for one or two frets choking the note.
If the vibrato sound happens when you play an open string only, you have to replace the locking nut. It used to happen to me when I had a Fender Stratocaster. My B string would sound strange when played open, with a slight vibration sound like you described.
Does it sound floppy as soon as you pick it, like when you're tuning a string after replacing it, and it's still very flat to produce a decent sound?
Last edited by Melek Taus; 07-01-2010 at 12:54 PM.
Reason: Floppy sound thingy