I want to take full advantage of HD video camera on my Droid Turbo, and found an external lavalier lapel microphone (Audio Technica 3350iS, which comes with an adapter for "smartphones including iPhone and newer Android phones"). But even when I use the adapter, the video recorder will only use the phone's on board mic. How can I disable/mute the onboard mic? Scoured the interweb, and at one point there was a perfect app "Mute Mic", but the NSA or Google or Motorola decided it was too useful to live. Any help appreciated.