Technically works, but isn't as functional as I hoped. It does its job well enough on Youtube, setting the volume to 0% mutes it, and 600% boosts it louder than I believe is normal, though I'm unsure it's "600%".

This wasn't my issue though, my problem is that it doesn't function AT ALL with Spotify, a popular music listening platform. Setting it to mute or to boost doesn't effect the volume at all in any way. I hoped it would be able to work on any site but I guess not, would be neat to see this fixed.