Short wav sample from a score. Also, that's a trumpet, right?
Sounds like flutter tonguing on a trumpet. It could also be double-tonguing in a very reverberant room.
Sounds like a trumpet double tonguing to me, but it's hard to tell with such a short clip and so much reverberation.
That sounds like Flutter tounging on a trumpet with either cup or harmon mute.
Its like saying rrrrrrrrrrrrrrrrrrr(spanish R ) while you play which gives it a growl sound.
Dont confuse that with growling though (another trumpet technique commonly used in jazz)... Flutter tounging and growling are two very different things