I'm having problems with this as well.

The only place I've found that talks about installing anything is the post you mentioned. I'm able to get through the first part, when I run "apt-get install analog_bridge" I get the error "analog_bridge: Depends: libsoundio-dev but it is not installable".

Also, what folder are the config files in?

I'm running on Raspian Stretch

Thanks in advance,
Michael AF6FB