Unfortunately, out of the box, macOS doesnt let you set app specific volume levels.

If youre looking for something free, we recommend checking out Background Music.

It runs entirely in the menu bar where, if you click the apps icon, you can set individual volume levels for the apps that are currently running.

The app decides that all apps can play music, even if they cant which is why each one thats running will have a volume slider.

The volume level for an app is set relative to the current volume level for the OS.

If, with the system volume set to 50, you set the volume slider for an app to its highest point, it will still only output 50 volume.

If you were to increase the system volume, the volume for the other apps will change accordingly.

Go into the More Apps sub-menu and you will see a list of every single app installed on your system.

Click the dropdown arrow next to the slider and you will see a slider for adjusting the leftright speakers.

Its been a part of the OS for years and macOS has nothing like it out of the box.

As far as copying the feature goes, its a near copy since its limited to maximum volume thats been set for the system.

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