Non-horn player has a Q

Hi all. I do not play the horn, but have a Q I was hoping someone would be kind enough to answer.

I am a composer, who like most others, has to rely primarily on samples to compose and make a living. It's unfortunate, but that's the way of the world. I have a sample library which has a solo horn patch, a 2FH patch, and 6FH patch. I am noticing something strange in the solo patch (one horn player, obviously). There is a quiver of sorts in almost all of the notes. It's to varying degrees, but definitely noticeable.

Here is a short, 2.4 MB file illustrating what I am talking about.

http://www.jeffreyhayat.com/jh_horn.wav

Is this type of quiver normal? This is from one of the biggest sample library devs around recorded in a major studio - and although I have no idea who the musicians were, I have to assume they hired accomplished players, as opposed to, say, a HS student.

Any thoughts will be appreciated. Thanks in advance.

I hear that quiver sound mostly in older players. That recording also sounds like the player is blasting as loud as he/she can. Not the ideal tone :unsure: