PA system with new audio API

So, I saw Cookie’s video on the new audio API, and he did a pretty good job explaining. But I’m just dumb, so…
I want to make a PA system similar to the walke-talke he showed off. Could anyone help/walk me through the process of setting it up? If anyone would this would be amazing and greatly appreciated!
https://youtu.be/FminS9nvqJg?si=rqWdHwKpW3CPNmAD
^^^ Video link