I am using the Deezer app music. It worked well, I could use the media buttons to control play/pause/next track/previous track. But a few days ago, (after an macOS update?) now when I hit play/pause it launches iTunes instead of controlling the Deezer app that is already running and playing music. It was correctly functioning before, so I don't know where this change of behaviour is coming from. This is very annoying as it makes the Deezer almost unusable as I have to bring it to front to control it.
MacOS – Play/pause buttons launches iTunes instead of playing/pausing the Deezer app
ituneskeyboardmacosmojavemusic
Related Solutions
I finally just figured it out! It turns out that I had a Quicktime process that was stopped (I had done an open on an avi file on the command line.) A kill -CONT on the pid allowed it to continue so I could close it and now I have my keys back!
It's possible, but not without third-party software or scripting.
You can use the Vox preference pane to set this though:
(go to Vox → Preferences → Controls → Setup)
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Best Answer
Found the answer on the Deezer community forum:
You have to allow Deezer the accessibility rights, go to:
You'll have to unlock the configuration by clicking on the lock and enter your system password.
The original answer can be found here.