Some (hopefully) subtle timing adjustments – let each instrument be a few ms ahead or behind the beat and give trombones a bit of a breath between each note. Still not 100% what I'm looking for, but better… Needed to focus on the trumpet too - it sounded more artificial after these adjustments… Better, but not yet right I think… Mix in the final "bassy" section is off - the tenor horns are a bit lost in the mix.