When I was still a 3 set up HTIB/TX-NR525/Tascam PA-R200 {Integra 30.4} Onkyo guy the processing was great even ATMOS content on those systems was something else. It would push a whole lot more to the surrounds.
Have you gone through your inputs menu's to select the codec? {Blue ray/Netflix etc.} I seem to remember all would typically show the volume as standard and needing to use the info to see input and so on.