I have been doing quite a bit of mouthpiece buzzing in the car to try to get my chops back in shape. I know there are questions intervals, but there seems to be something more than that involved when I stick the mouthpiece in the horn. There are things (primarily lip dexterity/slurring through intervals) that I do in the mouthpiece that change as the mouthpiece is inserted into the horn. I even tried experimenting by slowly bringing the mouthpiece to the horn, and it seems like it happens right about the time the mouthpiece gets a seal on the horn that the change occurs, so I don't think it's a question of interval, but the actual structure of the horn that makes the difference? For example, even at these early stages of "comeback," on the mouthpiece I am messing around, and discover "hey, I can still do a trill (not as high in pitch, but still)" Then I put the mp in the trumpet, oh no I can't, it's more like I'm turning the sound on and off. So, begin the trill with the mp disconnected and start moving the mp toward the trumpet - I seem to be moving a 1/2 step, etc, then the mp is just about locked in to the trumpet, and sound goes away on one part of it. Similarly, doing interval exercises I am thinking, I've still got something here, and I put the mp in the horn, and it's well, not hard, but not as easy as I remember in the old days, nor as easy as in the mp alone. So this begs the question (two actually): 1. Is mouthpiece practice going to help me? 2. What's the difference? Am I changing my approach, is is psychological, or is it the physical characteristic of the whole horn now absorbing the vibration as opposed to the MP, or a factor of resistance? I'm working out getting a teacher and schedule for lessons, but I find this an interesting question . . . I've been assuming that mp practice would go a long way to getting the chops back in shape and with dexterity, but I am questioning that now (although I still think it helps with exercising the chops) I am doubting the value in terms of knowing how what I am doing is affecting what I intend it do be doing (ie: practice and interval - will it have the same affect on the horn)? Should I just keep on buzzing and not worry about interval? Will this phenomenon just correct itself over time as I become accustomed to playing again? Thoughts?