Scanner audio stops when I begin listening to another app

In order to listen to Scanner Radio while also listening to another audio app you'll need to configure the scanner app so that it no longer requests the "audio focus" (and no longer listens for other apps to request it).  

You can do this by tapping on "Settings" at the bottom of a directory screen, then selecting "Player Settings", then scrolling down to the "Advanced" section, and turning on the "Ignore requests for audio focus" and the "Don't request audio focus" settings.  

Note that if you change these settings, the app will no longer stop playing audio when you place or receive a call since the app will no longer be notified by Android when a call is being placed or received.