Hello, I'd like to add to this discussion:
The vast vast majority of my opus files, that have been RG-scanned by foobar2000, are not volume-adjusted by Poweramp. Poweramp reports their RG as +5 db, as if that's some kind of default. I don't understand it. A minority has RG values different from +5 db, and for those few, the volume is adjusted.
I tried re-scanning my music folders after having signed up for the latest/unstable builds in the Play Store. If I go to the change log, the top title is "Builds 978-981:", so I guess I have one those builds where the opus RG fix should be present already, going by the discussion in this thread. And yet... most of my opus files aren't being volume-adjusted. FLAC, mp3, and ogg all work fine.
The RG preamp works, for what it's worth, for all files including the problematic opus ones.
What should I do?