Yes, thank you Alan for the informative replies! The rubber bladder in the A-34C and M-37C seems misguided to me, a saxophone player, since it takes volume/timbre options away from the player. I’m interested in buying one that can play loud (and still have a nice sound), so I think I’ll try the M-32C first. It seems like it has many advantages, and plays only a bit less loud than the M-37C. Cheers, Kuma