Changing the volume and the brightness are the main quick action keys used on laptops and thus should all be accessible with one click and in an order that makes sense for the user. Currently the Mute Audio key is next to the Brightness Down key instead of the Volume Down key which is confusing from a UX perspective and makes it hard to memorize the key positions when one related to Volume is on F4 and the others are on the - and = keys. It would also make more sense for the keyboard brightness key to be next to the screen brightness keys so everything is arranged by groups.