Sound volume in XFCE

[白い熊＠相撲道]

How do I control sound volume in XFCE? guix package doesn't show me any 
XFCE plugins I could install, none come installed by default.

I'm fine manipulating volume via alsamixer, however would like the 
little panel plugin so I increase/decrease volume there directly.

Or is my XFCE install borked? When I click on the Applications start 
menu, many items are missing icons etc, which shouldn't be the case.
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白い熊＠相撲道