Why don't you get a decent mic and record to your laptop and then transfer the sound to your phone after synching to the video?
I thought about recording the music into a separate track to sync with the video but I would rather have it synced together as one coherent piece. Otherwise I'll just get a used go-pro and run the audio directly to the mic input.
You could connect your phone to your laptop and your Mic and let the software record them on the laptop together. Specify the camera from the phone as the video input and the Mic as audio input.
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