I am able to look inside the .pkg file and have found multiple .psarc files in different folders. At present, I have found some streamed audio in the "global_uncached.psarc" file found in the packed/game/ folder. My main focus is the music from the game, but so far, I have only found the beginnings of different tracks from the .psarc. The other global .psarc files in "packed" contain dialog or other assets. Would either the highlights.dat or highmips.dat files be of any interest? They can be found in any three folders located in the packed/levels folder. Here is a link to the .pkg
file I am using.