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Now, more about my results. I went to band practice last night. Some of the stuff we play is pretty range-y, with lots of leaps, and I discovered what it's like to play a grippy mouthpiece on that type of material. I'll say this, if you think you don't change your mouthpiece setup over your range, use a mouthpiece like this and you'll know for sure. It got to hurting pretty bad after a while, and I had to switch back my normal, non-rubberized MP. I'll probably try to continue getting used to it, but now I DO understand the objections of people who don't like grippy mouthpieces.
For those who DO like them, let me say that I went around the inside of the rim and trimmed away all of the PD that was actually extending down into the cup. It had become sort of a loose flap, and I felt it was robbing me of some of the sound energy. Removing that excess made the piece sound just right, almost exactly as if the PD wasn't there at all. From that point on, the ONLY negative was the way it gripped, and I did perceive some positives. Fully aware that a placebo effect could be at play, it seemed to me like I had much more flexibility. Only time will tell if that perception was real or not.
I'll keep posting as I discover more. Thanks, everyone for your comments, questions and encouragement.
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Joe Baker, who was particularly intrigued to learn that Col. Conn started this way
