Thanks @Maarten Bauer, great idea.
I am interested in writing for saxophones. These days I am listening to some works for sax with scores. You've right, it's the best way to learn. I think I'll try first something for sax solo...
I loved the slower tempo part, it's awesome!
I encounter a problem now though, my plan was to merge everything together not in their audio file state, but rather as .midi files (notes), then assign instruments to them. Unfortunately I don't have matching VSTi, I'll try to find something that fits though.