I went and bought me a flugelbone the other day. It's a valve trombone built like a trumpet. Also called marching trombone. I got tired of all the unintentional microtonality that I produced on the regular slide trombone. Now, with the valves, I only have to learn to push the right buttons. Piece of cake! (...not.)
One nice thing about brass instrument though is how drawable they are. None of these three have the right proportions but I still think they're quite ok. And I had a great time drawing them.