The Sonic Port VX, Sonic Port, and Mobile In interfaces can be used in place of the built in microphone on your iOS device to input audio for iOS video capture, here's how to do it:
2: Launch the iOS Camera app.
3: Switch to the video by tapping the photo/video slider at the bottom of the screen.
4: Press the red record button in the bottom center of the screen to begin recording video while capturing audio from the Sonic Port VX, Sonic Port, or Mobile In. The audio input will be dry unprocessed audio.