I don't have the horn ready to play right now but given that someone else had the same problem, I feel more certain that it's a fundamental acoustical issue.Right, I'd really think it would be an octave pip issue. Did you try other mouthpieces on the horn yet?
Actually maybe that doesn't make sense either.
Can you finger the palm F without the octave key and make the F3 come out from the overtone?
Interesting. I don't think the upper octave pip is blocked but I can check. Maybe in the worst case it needs to be bored out to a larger diameter?I just did a few experiments, and I think I've ruled out the large chamber theory. I used a large chamber tenor mouthpiece on an alto, which should have a larger chamber than any alto mouthpiece. It played all the palm notes fine with no effort. Then I went as high as I could in the altissimo and made it up to Eb4 (couldn't quite get to zxcvbnm's F4), no problems. Then I tried without to octave key to duplicate an octave pip blockage. I could still play the palm notes, but it definitely took an effort to keep them from dropping. Altissimo wasn't much more of a problem without the octave key. So a blocked pip isn't as much of an issue with altissimo, explaining why the palm keys had issues but the altissimo didn't.
So I think a blocked pip is the most likely culprit. But I can say from experience that certain synthetic reeds try to drop the octave on the palm notes as well. I don't remember if the OP mentioned playing synthetics, but that could also be the culprit. I definitely have that problem with Legere. Even though zxcvbnm has exceptional altissimo skills, that doesn't necessarily rule out a technique issue on the palm notes.
I think you have to be very careful with the diameter. I wouldn't do anything drastic.Interesting. I don't think the upper octave pip is blocked but I can check. Maybe in the worst case it needs to be bored out to a larger diameter?
Be careful. It should not be a diameter issue, which has been carefully chosen by the maker. Too large a pip will sharpen the notes that use that pip and can cause other problems.Interesting. I don't think the upper octave pip is blocked but I can check. Maybe in the worst case it needs to be bored out to a larger diameter?
Hey so I just tried something and I think I figured it out for me so it might be the same for you.I honestly think there is just an acoustical mismatch between certain "French" or modern style horns and large chamber mouthpieces.
Not a question of mouthpiece, but of a certain combination of reactance and damping to sufficiently disrupt the first mode impedance peak at both soft and loud dynamic levels. That being said, it is well known that saxophone pips are very poorly designed, in that the pips tend to be too long and too large in diameter. Drilling out the hole will not help, and can seriously affect other notes, and can and probably will cause intonation and possibly response problems. The only way to optimize a pip is to shorten it and actually make the hole smaller, but this is by no means arbitrary.Chosen by the maker with a certain type of mouthpiece in mind.