The entry "Simultaneous output to..." tells us that in our setup the pulseaudio module-combine-sink, or a network combined device from module-tunnel-sink was loaded.
This can be done in an entry in
~/.pulse/default.pa or manually, e.g. by a script. It may have been loaded in the
default.pa used by the daemon or from an application that provides the network audio.
Changing the default output sink to this combined sink should be done after we loaded the sink. In addition we need to know the name of this sink which may be the default
"combined" or any other name.
Find out the name of the sink
To find out the name given we can list all installed sinks on our sytem with the command
Change the default output sink to e.g. "combined"
To change the default sink we can issue the following command
pacmd set-default-sink "combined" # or any other sink name or index
This command can also be issued from a script.
Make this sink permanent on start of the pulseaudio daemon
To define a default sink permanently on startup of the daemon we uncomment/add the following line at the end of our
set-default-sink "combined" # or any other sink name
In case we want this for all users we edit
/etc/pulse/default.pa, in case its for one user only we may copy (and edit) the
~/.pulse/. Make sure that this sink was loaded before.