Allows Airplay 2 on any WiFi network – AirPort Utility Review

As long as this app is available, anyone with an old Airport Express (802.11n), can configure it to “join an existing network” and VIOLA . . . instant Airplay 2 connectivity to their wireless network! The Express has a 3.5 audio jack. Plug in a 3.5 to RCA cable then connect the RCA end to your stereo/powered speakers. Simple.
Review by zbatiz on AirPort Utility.