RJ,

First, congratulations on surviving Hurricane Harvey. I'm a Houston resident, and saw that you were here for that event.

I've used USB microphones with Android phones/tablets in the past. Some apps are written to "see" them and some simply don't consider that an external microphone is even possible.

The classic case is the default camera app in a stock Android build, like you find on a Nexus 5X, Nexus 6, Pixel or Pixel XL. That app simply can't use an external microphone when recording video.

Other apps, including Open Camera and Cinema FV-5 Camera, are able to access the external microphone.

Those apps have a setting to "Use external mic (if present)" which is the magic. It's conditional, falling back to the built-in mic if no external mic can be found.

With respect to vMix Call...I performed a little test just now, placing a test call using my Pixel and a MiniDSP UMIK 1 USB microphone. The phone seemed to select the USB mic all on its own. So vMix Call also used the USB mic.



I think that on other phones this might not be so easy. There may be value in a vMix Call app for Android, to have explicit control of source devices. This is in part why I created a feature request for an Android Client app.