The music volume setting does not work

The music volume slider in the Music and Sound settings does not work.

What I expected to happen was...:
The music option slider would've changed the volume of the music.

What actually happened was...:
It had no effect.

HOW TO RECREATE:

Simply pause the game, go to the sound tab in the settings and move the Music slider around. It will not have any effect. I checked all other sliders and they have no effect tooo. Only the top master volume slider works.