I want to adjust music played by YouTube Music app (don't mix up with Google Play Music). How can I do it?
Built-in MusicFX equalizer doesn't affect YouTube Music. I also tried several external apps, which claim that they are OS wide, and in fact they're able to adjust sounds from standard Music app and Play Music app. But none of them work for YouTube Music app. They only can change volume while it's playing.
If you suggest app-based solutions, please, don't suggest apps that you haven't tried yourselves so they worked for you. If there's a solution with features shipping with Android itself, all the better.