dont ever take any advice from someone that says, do this and this, i dont know how they work and i dont care, i just know they do. thats what larry jordan says in one of his tutorials on audio. thats complete disrespect for anyone working in audio as well as teaching audio to someone wanting to learn. audio work is best done in audition or similar audio programs. shooternz is right about isolating out the shotgun, like he says its part of editing, sometimes we have to get in there and get our hands dirty, not everything is best left to automation. normalize will adjust the audio to its highest peak. so just like the shotgun being loud, normalize will just find that one loudest sound and adjust the volume of the clip based on that one sound. normalize can work sometimes, but really depends on the recordings. audition has a "match volume" tool that is designed just for this. it has several settings, some to normalize and some to adjust the volumes of the clips to an average volume. in other words it will look a all the sounds thru the entire clip and figure out by average how loud that clip is. you can tell match volume to have all clips match one you choose, or to match a desired average loudness. there is no guarantee that audition or any other audio tool will get it right. after you use match volume you still have to listen to the edit to find out exactly what it has done. you might have to adjust a few clips or alot... you can open the audio mixer panel and watch the volume levels bouncing around to get an idea how to adjust the volumes. most of the time it comes down to using our ears. so just like color correction there are tools (scopes) to see whats happening, but always have to verify with our eyes looking at the final video.
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