How to select correct Sound Card in Windows App

We've got the Windows 10 app installed. When an alert comes in, or worse yet, when clicking on Live view, the app takes over a mission-critical sound card and kills the audio we're trying to work on. SInce there are multiple sound cards in this machine, is there a way via a registry hack or hidden setting to tell the Ring app use a different sound card so our operators can talk to someone at the door without killing the audio on the main sound device? Seems a shame that this isn't a part of the app settings already.