I used to play on an intensifier and it helped out. When I asked my trumpet teacher if I should invest in one he told me to do it, but to do it with a different approach.
I would play with the sleeve on my mouthpiece for the first half of my lesson and record my playing. He was also in charge of the recording sutdio at the university, so I was able to make a ton of tapes.
Anyway, we would listen to the sound that was made from my playing on the tapes, then I woudl try to mimick that sound without the sleeve. I thought it worked out pretty well.
Of course then I dropped music as a major, didn't play NEARLY as much anymore, then the sleeve became a permanent addition whenever I would play.......
Andy Smith
Railmen 93-94
Madison Scouts 96,98-99