While I'm having a lot of fun returning to my trumpet, I'm finding myself doing something I never would have imagined possible when I was last playing. I keep listening to music and thinking that the lower brass actually sounds more interesting. I know, I know - TREASON! The trombones, baritone, euphoniums, and tubas must all be kept in their place in order that the clarion sound of the trumpet may reach the audience. But I keep thinking, and this Arban fellow showed other, lower, instruments above his fingering chart, which got me to thinking... and then I noticed that Bach had a weird-looking bass trumpet, and other people do too. And there are valve trombones, and... Reading about it so far, I get the sense that there's a major difference in mouthpieces between the trumpet/cornet/flugel range and the trombone/euphonium/baritone range. I'm guessing I'd stay with an instrument that has valves, so slide trombone is out. But if I were, say, to experiment with this, are there any of the lower instruments that are more approachable from a trumpet-playing background? More compatible with continuing to play trumpet? I may not go anywhere with this, as I'm definitely enjoying my return to trumpet, but it seemed worth asking, anyway. Well, apart from the treason part, or so we would have called it in middle school. Thanks for any advice you have!