My sound control keys F10/F11/F12 do not respond at once this morning

How can I make them functioning again ?

Stirling Dad wrote:
Is there any way to either:
1. make the F10, F11 and F12 keys provide the mute, sound lower and sound higher functions?
that's the default isn't it? if it doesn't work for you uncheck the box "use F1..." in system preferences->keybaord&mouse->keyboard.
2. have the sound functions assigned to other keys and leave the F10, F11 and F12 keys with their display application windows, display dock and dashboard functions?
no. you can't reassign volume shortcuts. if you check the box mentioned above you'll have to use fn+F10 etc to get to them.
I've tried various settings in System Preferences -> Keyboard & Mouse, but without success so far.
Three sets of questions:
1. Is System Preferences -> Keyboard & Mouse the right place to be looking?
2. If so, how should I set the preferences to accomplish what I'm trying to do?
3. If not, what is the correct application, and what should I specifically do?
Thanks.

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