I have carefully set up my Tanglewood acoustic bass, dropping the bridge by another mm (I'd taken at least 2mm off it a year ago) and tweaking the truss rod to get the action really nice and low and surprisingly the fixed intonation has improved.
Annoyingly there is one buzzing fret - fret 8 on the D-string, and it is quite bad.
Careful inspection and I'm 100% sure that it's a low patch, not fret 9 being high, so scraping fret 9 down won't solve t - just move the problem up a fret.
Looking at fret 8 it has a tiny crack visible between it and the fingerboard under the E, A and G strings (which don't buzz) but not the D. I suspect that in its past it has fallen on something that has given a hefty knock to the D-string right on the fret, pushing it in.
I expect that removing the fret and very slightly reshaping it, or even just replacing it would cure the problem.
But I don't have any idea how to remove it without damaging the fretboard, can anyone advise.