Ambient sounds are tied with the Music
When the music slider is turned up, the ambient sounds of distant doors opening/closing, moaning, screaming, dungeon core, etc are also heard. Before 2.0 you can turn the music off and still have them playing. Now you can't since it's tied with the music volume slider.
Game Version:
Steam Public
Platform:
Windows
Cannot replicate, let us know if it continues after the next patch