Jan 06, 2022
Hard to say. Is it a steel reed?
Sometimes it’s the reed shape, or the relationship of slot to reed or sometimes the blame might sit with the other reed in the chamber. I have a custom harp from a famous purveyor of custom harps which was always weird in the 2 hole draw. I thought it was just poorly adjusted but I couldn’t make it better until one day I looked at the blow reed and saw it was off-centre. Kind of annoying to have a $250 USD marine band like that but that’s another story.
Another possibility with the Session is the comb. Those are very cheap combs and I’ve seen some where I couldn’t tune a reed because the comb was uneven, resulting in an inconsistency. I was going crazy trying to adjust reeds but it was the fit of plate to comb. It’s very hard to check this visually because of the injection moulding. With a solid comb you can get a better view of the way the plate and comb match up,
I’m sorry I don’t have an actual answer, these are just some ideas I’d try to investigate. It maybe something entirely different, but that’s the best I can think of atm.