I’m assuming this is you playing all of the instruments? As a first Cubase project is an admirable endeavor to try an uptempo jazz trio. To make this work you have to speak the language of a seasoned bassist and drummer. It might be good to state the theme less and make the overall song shorter. That way you wouldnt stretch yourself thin on reproducing swing bass like here around the 2:10 mark. also think about getting the NI free Kontakt player that comes with 500 mb of sounds. May be a more convincing acoustic bass there. Keep it up