Sibelius' Finlandia Trombone Quartet

So I've been doing some multi-track recordings inspired by Christopher Bill and Jim Nova. I'm not great with Logic Pro yet, still trying to work out how to get the right sound. Here's the most recent recording I've been working on Finlandia by Sibelius It's a quartet arrangement I got off of MuseScore I believe, still trying to locate the post so I can credit the arranger.

I'd love criticism about this one and the other recordings I have on soundcloud! I tried to spend extra time getting this one well in tune but the bass is definitely tricky, as I've not played it for long. Balancing the parts is another thing I've been having trouble with, the only way I can reliably fix it is by rerecording :/ Thanks for listening!