Q: My MacBook Pro is brand new... literally just opened. Why do I have 2GB of Audio and 8GB of other.

You can return a new Mac within 14 days of purchase.

A new Mac comes with 90 days of free tech support from AppleCare.

AppleCare: 1-800-275-2273

First understand what OTHER actually consists of:

https://support.apple.com/en-us/HT202867

Download from the Internet OmniDiskSweeper and Grand Perspective (both free) and open them. They will show all of your files and the respective sizes.  This should allow you to determine what data is on your MBP.

Ciao.