How to stop playback of music player & FM radio

[altufaltu]

I tried using Kill App action to stop FM Radio but it does not work. Killing Music Player also did not work.
Are there any other methods to stop both of them?

[Martin]

The next version of Automagic will include a command to send media key events (like stop button) to the system. Media players listening to such button events should stop to play.

[altufaltu]

That's great, Thank you!