I made audio keys work. Added these lines in /home/user/.xbindkeysrc. The
keybindings can be obtained isuuing the command xbindkeys -k and hitting the
buttons. There's a blankl window that pops up.
## Volume down
"amixer sset Master 5%-"
m:0x0 + c:122
XF86AudioLowerVolume
## Volume up
"amixer sset Master 5%+"
m:0x0 + c:123
XF86AudioRaiseVolume
https://askubuntu.com/questions/97936/terminal-command-to-set-audio-volume
https://unix.stackexchange.com/questions/89571/how-to-get-volume-level-from-the-command-line
