Pierre Dutot is a French teacher (Lyon?) and one the major parts of his approach to trumpet playing is body resonance. He practices singing with an embochure set through the trumpet amongst other things... I have studied a little bit of his teachings and I have taken a lot from it. His sound is spectacularly huge - well rounded with incredible amounts of centered, fat, raw tone. Absolutely beautiful. I have noticed a great change in my playing/sound/everything since I added a few of his exercises to my routine of things I do everyday. Amy Gilreath at Illinois State studied with him on her recent sabatical... I'm sure if you looked her up and emailed her she would love to offer you more information.