Pocket Jukeboxes are tied to music volume

Pocket Jukeboxes are tied to music volume.

How to reproduce:

1. Turn the music slider to 0 and the musical blocks slider to 100

2. Load a world

3. Play any disc in a jukebox

4. Observe the song playing

5. Grab a pocket jukebox and play any disc

6. Observe the song not playing

7. Turn the music slider to 100

8. Observe the song starting to play

Observed results:

Pocket Jukebox music is tied to the music slider instead of musical blocks.

Expected results:

Pocket Jukebox music should be tied to musical blocks instead of the music slider.