Using the XF86 Volume Keys

Today I have a pickle. As the name suggests, I would like to use the XF86AudioRaiseVolume and XF86AudioLowerVolume keys with sxhkd.

Matching them in sxhkd does not work (the key is not recognized). Other keys, such as the XF86Sleep, work just fine.

Looking at xev, it seems that the keystroke is not controlled, only the key activation action (although trying to match the release event in sxhkd doesn't work either).

My first hypothesis is that another program is already capturing keys. Is there any way to find out which application?

- EDIT -

Other processes seem to fail to bind these keys (except kmix, sometimes). I really believe that some process is already capturing these keys, if only I can find out which process it is ...

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