Setting Music volume to 0% will not get rid of the music and sound like 100%

Changing the volume of the music to 0% will not get rid of it. It is very annoying because the music always starts when i test my note block music and it sounds like 100%.

What I expected to happen was...:
The music to go away.

What actually happened was...:
The music played as if i kept it at 100%.

Steps to Reproduce:
1. Get the music to play.
2. Turn the music to 0%.
3. The music should play like it is set to 100%.