I have a friend who is having huge problems with his intonation. No this isn't one of those "I have a friend, but it's really me" cases. Last night we practiced for about three hours and I managed to get him to listen to my intonation, then his, over and over until he finally even realized he had a problem. He's putting a sort of puff of air inbetween the distinct tounge sound and the tone. I've NEVER heard this kind of problem, and he's been doing it for years because nobody ever sat down with him to work it out. He's relying on the air to start vibrating his lips right? Emphasis on relying of course. I've heard people who simply didn't tounge to start the note, and they have a sort of air sound right before their lips finally start vibrating from the passing air. Is this sort of the same case? He's using the wrong part of his tounge to attack notes as well, using the middle all of the time, instead of exclusivly in hard and heavy sections. Could that be part of it? Maybe he's not getting the tounge out of the way fast enough? The tounge noise is VERY distinct. If you could tell me where this problem is coming from, or tell me a different way to explain the problem, it would be great. I'm just a high school senior, but I've recently taken on a crusade, encouraged by my band director, to whip our trumpet section into shape, because frankly we're in sad shape. So thanks in advance for any advice you can ship me.