Hey Ziret - This thread was sent to me by a customer but I can’t find your email. I had Zach look to and he does emails full time ant this point and he couldn’t find it either. I will call the store when they open and see if they have unchecked messaged. My apologies. You can always call or text me at (808)781-9168 or email andrew@theukulelesite (sorry we are not seeing the previous one!?)
As far as the issue, since it’s a public discussion I’ll let you know here. I just tried a handful of Opio tenors to confirm and it’s that way on them. For almost all of our customers, they love the tone and it’s not an issue. On some level, you build either for volume or sustain. The D# area that is not sustaining is also more punchy so the resonant frequency or overall pitch of the body is causing that to come through stronger for a shorter duration. I know this because if I tune it differently the issue moves to the same frequencies. Tuning down reduces it, and a lighter gauge for that string will reduce it slightly. It happens on some level with pretty much every acoustic instrument but some are more noticeable (usually more projecting/ punchy ones).
You can play with different things inside the body or at the headstock but usually you’ll just move the resonant frequency. It usually ends up somewhere unless you make significant structure changes which will also change the overall tone that you enjoy. One of my personal ukes, an expensive custom built one, is super loud and punchy, but has a few frequencies that just don’t sustain. I love the sound and it doesn’t cause problems for me. I never notice it when just playing and enjoying it, only when checking the notes individually. Most players pick up an Opio and just love the tone and feel and never even hear a problem because it’s not affecting what they are doing. Lots of customers have bought and loved this instrument from us and it sounds just like yours. In fact I can only recall two other people noticing this since we’ve been selling them for the last few years (same thing on the sapele) and many people finding just what they were looking for. So it just depends on the player and generally people don’t have the same criteria. We QC them and set them up to play great but each brand has people that will love them and others that will have issues inherent to their design and sound. We want all our customers to be happy, and have no problem getting it back. If this is an issue for you then I understand and we’ll do whatever you want and work with you to make it a good experience. So just let us know what you’d like to do. I don't normally have time to check in here so please contact me directly. Mahalo.