If you are wanting to extract the sound no matter how poor it may be you will need to import the Video File into an editing program so that you can see the clip data. Sound is encoded as part of the video and can be extracted with an editing program and most likely that would be on your computer not your phone using an app.
I think you misunderstand me. This is a comment regarding the APP and the settings.
There is an option to select 2 alternative or combined microphones in the APP. One activate the camera microphone, the other "the microphone" which I assume is the iPhone microphone - which I have experienced it to be(!). Using "the microphone" place a audio file in the APP on the iPhone, different from the camera microphone placing the audio in the video.
My question is How do I retrieve the sound track placed in the APP from the iPhone microphone? With reference to the CGO APP: The Pictures captured and loaded on to the APP is possible to move to the Picture database in the iPhone, both one by one, and in batch. The Audio on the other hand only have the option to delete, not export to the iPhone.
So again - How can I get access to the audio file recorded in the APP with the iPhone microphone? .So to your comment, I am a pretty experienced video editor and my intention is to use an external microphone on the iPhone to capture better audio and align it to the video in post in my Final Cut Pro X on my Mac.