| Obviously few could answer with affinity without a macro picture of the problem. The following is simply my opinion & doesn't make it anything more.
You have obviously read the sticky, so there's no need to cover old ground. However your straight edge indicates relief yet contact when the Bass is plugged into the amp and it played amplified as normal plucking strength & direction....And if the owner does not play a flat neck it will be a matter of playing detective.
You indicate the radius height strings (A & D) are those that cause the issue (when played amplified and normally) may indicate odd area relief issues or uneven fret height obviously, yet there could also be a swell in one or more frets within the given group that are measured.
There are many techniques for finding a fret swell. But they all of have some flaw. If the strings are bent during playing there will be bright spots, sub 1/10,000th may not indicate a problem with higher actions, etc, etc.
Plug the Bass in and amplify a bit and place your finger against the fret and then in the middle of the two frets that yield a buzz. If you can diminish the buzz by finger placement in fretting technique then the issue may be very subtle and a fret dressing may not be appropriate. With some necks a buzz (in low action) may simply be playing technique and that neck demands a certain touch.
But if it is (buzzing no matter the technique), working with same radius as the neck in very light gentle strokes; see if you get a high spot. If you've tried color wiping the frets and magnification to find a wear spot get a fret-dressing board and something a lot finer than 400 grit.
Last edited by john grey : 07-11-2011 at 03:57 PM.
| 
