this is mod is similar to the previous one I've done (https://modworkshop.net/mod/40697 ), except it uses the original PS1 music instead of the PSP music.

stealth- Seven Sisters High School (https://www.youtube.com/watch?v=RJneUxGz7FM)
buildup- Evil Moves (https://www.youtube.com/watch?v=dSbhvvmzK7E)
control- Tension (https://www.youtube.com/watch?v=W40_C7TDqGM)
Assault- Battle (https://www.youtube.com/watch?v=o1esrf1jKqM)

extract the folder and put it in the mod_overrides folder because it's dependent on BeardLib, though if you want to place it in the associated Custom OST Tracks mod folder then it should be fine too