...I had to change my strings!
Actually, I love the sound of new strings, but there is definitely something to an old, dead string. (Think Benard Edwards, James Jamerson, et al). They're thumpy with no overtones. That's a sound.
Recently, I asked TB's what their favorite bass sound was on this video where I use a few different basses. The response was 4-1 on the first -- which is an old 62' reissue P bass. (1989)
http://www.youtube.com/watch?v=rgP1tSGV4e0 BUT, I completely forgot, that the strings on that bass were about 4 years old when I recorded with it!
They finally got to the point where they were fraying and they had to go. (I recently re-strung all my otjer basses so i didn't even have an old set I could switch on).
Now I'll need a good 6 months to break them in.
Maybe if I polish the fingerboard with the strings on?
Anyway, just another perspective. Sometimes what works best isn't necessarily the newest and/or the most expensive.