Thanks for your opinion. But there is no "style" (the Integra doesn't have styles or any automatic playing), so your criticism concerns what I did myself: I did the whole thing from scratch (in 2 hours), there isn't even an automatic drum rhythm. I played everything you hear manually, every banjo strum, hi hat and snare hit, clarinet, trombone etc.
So there's a problem about the density in my arrangement, and it's no wonder, I just took less than 2 hours for it playing drums, bass and banjo manually and making up all those improvisations of trumpet, trombone and clarinet. I guess I would have to thin out the arrangement especially with respect to the clarinet, it should only play short phrases whenever the trumpet has a break. I tried to to that, but it still got too dense, so the whole thing is a bit too busy at times. Additionally, as Donny says, banjo and also drums are too dominant.
My main question however was about the sound of trumpet, trombone and clarinet. I'd like some more opinions about them.

P.S.: I checked the original again. It does sound busy, too, but banjo is less dominant, and the bass is not a walking bass most of the time as I did, but a slow one playing dominant, fourth and fifth mostly. But I think I wasn't very far away from the original sound, given the little time I spent for it. Noting down all the impros of the original in written would take a whole day i guess