I have a third party radio app that I listen to all the time. Then I want to visit a website which has sound (or a game).
Is there a way to mute sound from one application on macOS ?
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There's a nice open source app, BackgroundMusic, that provides for per app volume control in OSX10.10+:
Finally something that works like in windows
Volume Mixer for Mac lives in your menu bar. With simple features like muting apps by double clicking and detaching an app from the master volume by right clicking, Volume Mixer is easy to learn and simple to use.
Sadly not for free but it seems to have been harder work than you think, so support the devs!
Audio Hijack Pro allows you to mute sound from any application. It is actually for recording an application, but you can mute applications as well. You can use the demo to just mute the sound. You shouldn't have to purchase a license.
Here's a screenshot. As you can see, the controls are at the top.
Also take a look at Hear, a systemwide Audio program that does mixing, EQ, etc.
SoundSource is good paid application ($40) that allows volume controls per application and also allows sound device selection per application.
I suggest you use jackosx, which is free.
Perhaps I'm missing something here (emphasis mine):
Is there a way to mute sound from an application?
If you are looking to simply mute quickly across applications, couldn't you just use the 🔈 key (I know, the emoji is not an accurate representation of the key, but it's the thought that counts, right?)