Support devices with App-specific volume features

[domportera]

Im currently using a OnePlus 12 and it supports app-specific volume mixing. When JamesDSP is enabled, this functionality is broken where using the system's app volume sliders between 1-100% is always full volume, and at 0% it is properly muted muted.

My old LG v60 has this feature too, and most motorola phones do as well. i know these are custom implementations (because for some reason in 2024 this isnt a standard feature) so it may not be possible to sustainably support it, but itd be really wonderful if it could be addressed