I'm a Rich Matteson fan. (he sure is missed). I enjoy his improvisational ability but also the skills he displayed when he played. Incredible jazz vocabulary, incredible sound and range. Playing on a non-comp Yamaha Euph I think. What are modern jazz improvisers who play Euphonium using? Non-comp or comp euphs? I play tested a Yamaha 321 tonight using a 6.5AL small shank mp. I was comparing it to playing my Mackbrass Euph (642 copy). My range and control were much improved on the Yamaha. I got a much bigger sound on the 642 copy. The small shank mp allowed me to have much increased range and more command over the instrument. I'm sure the smaller bore size helps with that also. I will say that I'm a tuba player that plays Euphonium, so Euph is a second instrument for me. What are your thoughts?