I'd first like to say that I've never really been one to buzz my mouthpiece for an extended amount of time (especially buzzing without the mp) but with addition on a BERP and this book...WOW! What a great book.
I've been trying it out for a while now and does it ever feel good when you're done the first chapter (1st 8 exercises). I recommend trying it out. It helps a lot with centering the pitch and doubles as a pretty good warm-up.
Anyone else use this book or have tried it? The buzzing book