Each slider by default is set to the middle and doesn’t change when you raise or lower your volume. But in Background Music, the volume sliders aren’t relative to your master volume. From your menu bar, you can adjust volume for individual applications. Background Musicīackground Music is a simpler app that does much of the same thing as Volume Mixer. It’s fairly steep pricing, but if you need the features, it works great. Volume Mixer comes with a free seven day trial after which it’s $9.99 for two copies or $14.99 for lifetime updates. If you want full control over your output audio, it doesn’t get much better than this. These include increasing the volume of an active app, decreasing the volume of an active app, toggling mute for an active app, increasing/decreasing/muting background sound and increasing/decreasing/muting notifications. You can also set highly convenient keyboard shortcuts for specific actions revolving around volume control. Over in the Preferences, you can choose your default output source or just quickly change sources on the fly. Adjust it as you’d like, mute individual apps entirely or click Refresh to bring an app on par with the master volume. Each app, much like on Windows, is accompanied by its own volume slider. The app sits in your menu bar so you can call it up as needed. Volume Mixer is the first Mac app on the list and it allows you to control system volume by application.