Ghost Note?

[andvari7]

I recently changed the strings on my fretless sixer (they were the stock strings ESP puts on their basses; I kept them after I defretted it), and while I don't regret using DR (I have been for some time), there is a problem with the D. At about the ninth fret, it starts to sound like there's a ghost note, and it continues until the 24th. I would normally chalk this up to a truss rod issue, but it's only on the one string. It does this when it's plugged in, too.

What's going on?

[tZer]

If you muffle the string at the nut (ala Victor Wooten's hair scrunchy technique) - does the second note still happen? I am assuming the note changes in pitch - as you move up the neck (making the fundamental note increase in pitch) the 'ghost' note decreases in pitch?

If so, if would seem that there is some sympathetic vibration coming from the neck and being transferred to the pickups. Does the pick guard (oh, wait... do you have a pick guard?) - if you do - does the pick guard touch the pickup covers at all?

I am no expert - far from it - but I did refinish a bas a while ago and discovered some things about pick guards and pickup covers that don't fit properly and transfer sound from other parts of the instrument to the pickups.