I installed linux x-rebirth and both extensions. When I click on the desktop icon, it starts up and has no sound. Using alt-tab, I exit. I launch PAV and it shows monitor and sound card under tab output devices. Clicking on playback, I try to change the port to HDMI monitor sound from sound card. It will not change it. Also, I am able to switch back and forth from sound card to HDMI monitor on the Firefox application.
I installed x-rebirth in normal user mode.
The command line output displays this.
(pavucontrol:4142): Gtk-WARNING **: Theme parsing error: gtk.css:83:29: The style property GtkStatusbar:shadow-type is deprecated and shouldn't be used anymore. It will be removed in a future version