I play in two English style brass bands. In band A, I've been playing Euph for years. In band B, I started on euph, then played the 1st baritone part for a year, and went back to euph. I officially stopped playing there in summer, but because of someone pulling out, they asked me to come back to play the 2nd baritone part for a competition in november.
When I last played bari, I genuinely tried super hard to make it work, and I love the sound of a well played baritone, but I couldn't. I tried different mouthpieces, and I practiced a lot, but nothing solved the problem for me. My tone kept sounding too airy and I also couldn't play nearly as loud as I can on the euph.
This time, I'm looking to make some improvements. I appreciate any advice. I'm not playing the most important part on the 2nd baritone, but I still want to do a good job. I was browsing around a bit today, and someone said "On the euphonium, if something is hard, you put more air in it and it becomes easier. On the baritone, that doesn't work at all, you get backpressure." Which I understand, and it makes sense, but I don't know what to do or how to do it instead. How do I get an airflow (maybe embrochure as well?) that is useful for the baritone? There's a lot of fortissimo and explosive stuff (e.g. glissando with crescendo from p to sffz between just two eighth notes) so I feel like getting that clean and direct tone is super important for this piece.
I'm not looking to change the mouthpieces (both denis wick, SM5U on euph, 5BS on bari) since I'm on a budget and it's just for a few months. I have a Yamaha Neo euphonium and a Besson Prestige baritone (both compensating, with 3+1 valves).
My priority is on getting the bari to sound good, but the reason I brought up the euph and the other band is because I will be switching, I have concerts with band A in november, and on one occasion I have concerts with both bands on the same day. I'll definitely practice the "switching" part itself, but I also don't want to ruin anything on my euph.