Patrick, Hmmmâ€¦.I may be misinterpreting what you wrote. I donâ€™t consider this to be a whole horn issue as youâ€™ve written. The resonant quality of the notes (in all registers) needs to be consistent, but the way the body chooses to get the notes to ring will most probably change from register (does that make sense?). When I think about a resonant or vibrant sound that is well centered, it is specific to an individual note on the horn. When I cultivate a forward, â€œbuzzyâ€ quality on the mouthpiece / leadpipe combination it transfers directly to the sound that I want on the horn. When I focus on that sound quality and let my body do what it needs to do get that sound, I am by definition aligning with the place where the horn wants to resonate best for any given note. Maybe PH or BillyB could add to this as they are closer to the source. I know what works for me, and I find the leadpipe helps me to lock into that vibrant quality that I want in my sound.