https://www.cnet.com/news/eartrumpet-is-the-only-volume-control-app-you-need-in-windows-10/

A joint project among former Microsoft engineer Dave Amenta, engineer Rafael Rivera and developer David Golden, EarTrumpet is a volume control app with an exceptionally clean and friendly UI. It makes navigating your various audio devices on a Windows 10 machine much simpler.

In the space of only a couple of clicks, EarTrumpet allows you to manage default audio devices and change the volume on individual apps. One of the real benefits is that it provides a quick option to mute web browsers, should something start playing in the background and ruin your Spotify sing-a-long.