I really though I posted this earlier but I couldn't find the original post, so here we go again.... this is a long read and took me a while to write out once today... I must have only previewed instead of submitting... ARGH!! This one might end up a little more scatter brained so bear with me. If this is a better fit in luthier's corner mods please move it. Last week I received my Carvin LB76 after months of waiting, the bass play absolutely fantastic and sounds great to boot, but there is one issue that I am having with it. I get these weird overtones/inharmonics (I don't know if that is the right word here) on the B string when I play in the second octave, anything less than the 12th fret sounds fine, the 12th and over have the issue. It sounds like a steel drum is getting beaten off key behind the note, it sounds awful. The issue exists even when the bass is unplugged. I have included a picture of the bass (you know the rules here, no pics no bass ) as well as a sound sample of the issue so you can hear what I am referring to. On the sample I hit every string open and at every marked fret just to show the issue does not exist anywhere else. I get to the B string around :48 and I get over the 12th fret at around :52, you can hear the issue pretty clearly. I apologize for the fretbuzz, at the time of the recording I was testing out a high setup with tons of relief and was pressed for time recording. I did some reading and some people suggested the pick ups could be pulling the string off key, even affecting it acoustically. I have radiused pick ups so I thought this could be it. I lowered the pick ups extremely low but there was no difference in the issue. I did get the piezo bridge, I have no clue on the workings of these or if it could be the magnet in it causing the issue. Next I heard using a non-tapered string could help, so I swapped out the tapered B for a non-tapered B. I thought this made the issue slightly less pronounced but I don't know if it really was or if it was the placebo effect. I also attempted stringing through the bridge instead of the body but there was no change. I have attempted various setup styles to see if anything made a positive change, nothing really affected it, so I brought it back to the factory specs, which are pretty fast and pretty low. I am pretty much out of ideas, my only thought now is maybe it is due to the fact I had the bass made out of swamp ash. I wanted a light bass and I worry if it is having sympathetic vibrating causing the overtones. I doubt this is the first swamp ash LB76 in all the decades they made them. The only other swamp ash bass I have played was a Dingwall 6 string with a bolt on neck, the B sounded great. Since your going to ask, yes I have been touch with Carvin. I am currently in the process of sending the bass back to their head guitar tech. I am really hoping he can fix the issue because I truly love this bass, it plays spectacular. I was just wondering if anybody here maybe has any ideas/suggestions I can try to possibly avoid sending it away.