Okay, I installed it in Trisquel 9 (should work/fail just as well in Trisquel
8, or Debian which is what I think andyprough uses). The indicator works when
run in a terminal
$ indicator-sound-switcher
and starts automatically on login. (See screenshot) However, only the
indicator works. Nothing appears in a systray. So it is DE agnostic, but you
need an indicator applet. In MATE you can add one by right clicking on the
panel and selecting "Add to Panel..."
The README does say that it should work with a systray though. It might be
worth filing an issue on Github if you prefer that over an indicator.
