So I've replaced the original file. Still much left to be improved, but:
- cleaned up the mix
- bass plays calmer pattern now
- second key shift before last verse with added trombone glissando (here it's a SRX 06 trombone).
So the version has more dynamic development now.

https://soundcloud.com/rorosetree/midnight-in-moscow-dixieland-on-roland-integra-7