Crash Issues

I was thinking about SoX
It can do normalizing, compression, trimming and encoding.

There are some example scripts in this topic: Batch Scripts with other programs
I may be able to help a bit if you want to give this a go, but I’m not an expert with Bash, and I’m on Linux so some things that work here may not work on your machine. If you can get this to work then you may be able (after giving it a good test) be able to process the whole lot.

Are the files all in the same folder, or different folders - how do you have the files organised?