потом вешай keybind

<keybind key=“C-A-Up”>
<action name=“execute”>
<execute>amixer -q set Master 1+</execute>
</action>
</keybind>
<keybind key=“C-A-Down”>
<action name=“execute”>
<execute>amixer -q set Master 1-</execute>
</action>
</keybind>
закоменити строки:
<keybind key=“C-A-Down”>
<action name=“DesktopDown”>
<dialog>no</dialog>
<wrap>no</wrap>
</action>

<keybind key=“C-A-Up”>
<action name=“DesktopUp”>
<dialog>no</dialog>
<wrap>no</wrap>
</action>