Delayed attack is my lifelong problem since I started playing. Sometimes gets better, but it's always around and now that my new teacher has started a kind of assault to solve it, it's getting worst the more I think of it. I'll try to explain: as the mp touches my lips the throat (glottis I think) closes..I can use any kind of attack, I can breath a lot or at the last time, my tongue gets stiff against the teeth as to force the air out. My first teacher said that I am too much tongue conscious and I have to place more attention on air, so I tried air attack. But if I make one with no mouthpiece on my lips it's ok, the moment the mp is on I feel there's too much tension on the corner, at the bottom of tongue etc... When I play in big band, quintet or combos the problem eases except when I have to play short detached notes in sequence, it's like opening and closing throat any note I play. When I study or play solo trumpet pieces it's very noticeable, ruins my good tone and phrasing, makes playing unpleasant for me.. Well...any help from you fellow trumpeters? Thanks!