I can't reduce the volume of the music either
In Windows, you can click the sound icon in the Windows Notification Area of the Taskbar that looks like a speaker. In the small window that appears, drag the volume down to turn down the sound.
But that would reduce the volume of everything of the PC wouldn't, it?
I wanted to play while listen twitch streams or chit chat on discord
Sorry, unfortunately in the current version only the sound can be changed by the method mentioned above.