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Because I love hearing music, I decided to create shortcuts using Spark to control music.
So here is a little screenshot (Sorry it's French :p) to let you see what I did to control music and sound:
You can check the box, it will popup the played song, which is great! :)
And here are my Ctrl / Windows / Alt keyboard pref keys:
Go to keyboard and mouse pref pane:
Then click on "Touches de modification" button.