I only record stuff with my cell phone or ipad.
Before I fixed my volume problem with microphone placement,
I fixed it with "normalization":
https://en.wikipedia.org/wiki/Audio_normalization
I can't hardly hear this unless I'm wearing headphones:
https://www.youtube.com/watch?v=JsER4axHdmw&t=12s
This is the same thing normalized:
https://www.youtube.com/watch?v=kxOlIs_iZC0
-Mike