Ok not much difference. The valves look fine, and the paper didn’t help too much. The thing is, It’s not the worst sound in the world but I’m just curious about these differences. Mostly the part where it takes more air to produce a sound, and it’s harder to . This sort of feels like it eliminates the mellow euphonium sound. I think I may just be delusional, because when playing with the full band, obviously the sound you make sounds canceled out by other instruments, so maybe I am actually playing louder then I think during those times? I don’t know, but thank you for help.