There is very low sound at high volume with same previous settings and no hi res option after pie update for s9+.
Max has told you above what he plans to implement for the time being.
The massively diverse combinations of different ROM levels, different manufacturers' implementations and mods to those ROMs, along with high-res not being a universally supported chipset feature anyway, will never be a perfect 'finished' science. There will always end up being some compromises somewhere - and it will most likely happen all over again when Android 10 gets released. The nearest thing to a perfectly compatib