it works really well, I just have a few suggestions:
1. Naming is important, Create a Brand name then add a Volume booster in the end for example:
Naruto | Volume Booster (Hahaha)

2. i cant understand how boosting volume to 600 is practical, i like the idea of having options but sliders must be easier to work with, maybe fine a more practical way to implement healthy boost and options for people who want more

3. Keep it up, Be good