I have been trying to figure out how to put this without it being a dissertation so here's my best shot.
Since playing warm-ups at ppppp... my aperture had to become more compact and it feels round..
My results ... or impression was that the core sound increased and my playing became more efficient .. slurs and jumps have become easier.. so easy that the least little bit can be a missed note if I am not attentive.
I also noticed that my ability to strike a note as a lead player sffz would seems to take a different type of aperture .. sort of bigger and maybe a little spread.It really happens subconsciously by the way. I can still sound the trumpet but when you play lead there is sort of a commanding lyrical quality ( even though no self respecting lead player would put it that way)
I think that is enough to give you the jist ..