On iOS just start the Audio Recorder app that comes built in. Fly your drone like normal with the DJI App. When you are done stop the audio recording. Add audio track to video in post. It provides a dramatically better video without a musical track. The iPad and iPhone 6 really did a great job of getting background noise and the drone when it flies overhead without being annoying. Didn't interfere with the DJI app at all. I think I'm always gone to fly with Audio recorder running.