hi Gary,You're right.. is hard to explain with words only.
I just published a video on Youtube -I hope that I managed to explain what I mean 
Greetings,
Bogdan
Sigh. Based on your video, you seem to think I meant that saxes are supposed to sound like that.
As I've already said, that's not "just how sax is". It is a problem when a sax player doesn't suck in the condensation and/or warm the sax before playing and you get that awful crackling sound. But no, sax isn't *supposed* to sound like that, unless played unprofessionally. But they recorded it that way. It *is* a real thing, but they should have basically taken a break and recorded the sax after the condensation was removed. Either they didn't want to pay the studio session time to wait to clear the conensation (which Yamaha should have been able to afford) or the engineer recording it didn't notice the spitty take.
Also, the same issue showing up across 7 or 8 semi tones *could* mean they sampled it only once, yes. But it would also show up if they'd sampled each note (which I also doubt they did. As you know, typically it's every 3rd-5th note, but I've seen some get away with once an octave, so once in 7 semitones is certianly possible)
And yes, they reuse samples for other voices. They used to even tell you in the info description: "Same piano as Grand Piano1, but brighter; same etc but mellower". About 10-20 years ago, the info button would often even mention how many dynamic sample layers! Unfortunately they no longer include the info button

I get that you're disappointed, you think it's a distortion caused by incorrect VU levels during recording. I'm explaining that's not the case *here*, it can happen with sax playing *live*, *especially* with gentler blows... but when playing for a sample, they should *never* have left the spitty recording in, unless they specifically called it "spitty sax". No, they should *not* have used a spitty take for a pro grade sample, you're not wrong there.
Here's another youtube video explaining how the condensation builds up in a sax (they even have 'spit absorbers' for sax players to help with this issue).
51 seconds in:
https://www.youtube.com/watch?v=Z7HsGtwABkwAre you hearing things? Absolutely not; in fact, the fact that you're probably the first person to even notice the spitty takes means you have *excellent* hearing. Does my explanation fix the issue? No.
*Is* it an issue? *YES* it is. Sax should be breathy at low breath intensities (which is how they recorded it exactly 1 octave lower*), but it shouldn't be spitty. That's unprofessional. Really *can* happen, but really shouldn't.
*Again, when recording samples in a studio, the engineers usually request lowest to highest note sequence. As spitty sax sound usually doesn't even show up right away, it's when the condensation becomes enough to condense into actual drops, you *couldn't* get a spitty take on the first notes you recorded if you tried.
It basically means the musicians and the engineers didn't communicate properly. Imagine if they sampled a guitar player pitch bending several strings at once , but the player using a Floyd Rose bridge didn't nail the relative pitch and it didn't actually end up on a standard note. It would be awful, and they should definitely not use that sample. Unfortunately, that's what they did here.
I'll email you a registration to bypass the spitty low sample takes by switching to Alto (interestingly, neither the S.Art alto includes any spitty takes, nor the older single or double dynamic layer sample saxes include any spitty notes). Not really a solution more of a workaround.
Btw I just tried the Jazz sax on the PA5x. Similar problem on the highest notes, but somehow it's worse: you can tell they tried to apply some sort of AI algorithm to hide the spittiness, so what ends up happening is there's a weird... almost a click... when the alogirthm is applied and then when it comes off. And it gets even weirder because they only have 1 sample for the key off, so there's a secondary choke sound that's way too attacky for a gently blown note (it actually sounds brilliant at higher velocities, but sounds even worse than your example for lower velocities). If you can go to a store and try it! It's present in all notes D4 and above.
Tenor Jazz sax 1, they also left the spit take in (but it's not as loud)... but it will drive you nuts because where Yamaha recorded the entire length up to the spitty take, and the looped after? The Korg loops right before. So you actually hear the spitty sound on and off... so you can hear the length of the loop is about 1/5 of a second, and like it's constantly 'puffing' in the background 5 times a second. *not* a sound a sax can produce, no. To be fair, the S.Art Yamaha sax, also has the same repeating puffing distortion from the loop at F3.
It will also drive you bonkers... I can't unhear it now.
Interestingly, on the Yamaha, at B3? The lowest sample layer isn't even there, I'm only detecting 2 (neither of which has a spitty take at low velocities).
Mark