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So, I want to bind two different keyboard keys to the system mute function. I go to system settings > keyboard > shortcuts > sound and media and find the Volume Mute setting and enter the second shortcut I want for it. However, this deletes the first shortcut. How can I bind two keys to this function?

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Take a look at this… – Mitch Jun 19 '12 at 5:25

It is quite easy to do such a thing if you know the command for doing that function.
If you are using ALSA sound driver, the commands are :

amixer set Master mute` for muting the system

    "amixer set Master unmute" for unmuting the system  
    "amixer set Master toggle" for toggling volume.  
    "amixer set Master <vol>" to set volume level to <vol>

So, in the Keyboard shortcut option, click on Add and in the Command box, enter the functionality that you want.
Hope this helps.

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None of those commands are working the same way as the existing command. Toggle will only turn the sound off but not back on. Mute just turns it off and unmute only turns it on. – John Stimac Jun 19 '12 at 15:57
someone filed this bug – Piyush Jun 19 '12 at 16:03
How does the normal shortcut make it work then? – John Stimac Jun 19 '12 at 16:47

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