On modern Windows, the system has a volume, and then each app also has a slider in the mixer settings. Most programs, for example Spotify, then provide another

On modern Windows, the system has a volume, and then each app also has a slider in the mixer settings. Most programs, for example Spotify, then provide another slider on top of that. A notable outlier is foobar2000. When you change the volume slider in the app, it actually changes it's mixer volume.