So a while back, I saw a tip on a video by Fstoppers which completely changed my YouTube videos in terms of audio. The tip was to get an app on your iPhone called iTalk Recorder (there'll be something very similar on Android too of course) and use that to record audio. At first, I didn't really think that it was going to work but I needed good quality audio for a small video I was filming so I thought I'd give it a chance. I recorded the voiceover, downloaded the footage, synced the audio to the video, and it was amazing. It sounded really, really good! I know that this may not help everyone, but even if it helps one person it was worth it 
. Thanks guys.
. Thanks guys.