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I just discovered that the combination of Cmd+F10 (without any Fn key pressed) muted my mac. I wanted to know if it was a built-in keyboard shortcut as it does not appear in the System preferences.

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If you have 'Use all F1, F2 keys as standard functions' unchecked, that's the behaviour.
With or without the Cmd key, F10 mutes. Incidentally, so does Ctrl/F10 or Shift/F10.

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