Titlebars usually have minimize/expand/close. But why not an audio slider or enable/disable button? Is there some way I can add an audio button to my windows?

Sometimes I want to quickly mute a game but the only way is to open up my tray, open audio mixer, and scroll down a list of programs. And sometimes it shows up twice for some reason and only one of them controls the real audio. I just think my way would be much neater.

I'm using Linux Mint with PulseAudio.