I don't own the DB1, but one DB2D which runs with my beloved white 802D3.
I deeeeply love it and you can't find virtually any reviews of that one. So... You're not alone.
Really love the App to control it, but noone can answer me that question:
In the App, switching the profile from music to film (or vice versa) - what REALLY happens? Nothing to read in the manual or elsewhere. Does anyone of you know what changes then?