UPDATE!
Every soundtrack has been re-encoded. When I originally made most of these soundtracks back in 2018, I didn't bother to mess with each song's volume level by much, so a lot of songs sounded too loud. Every song should now be less loud and have more consistent volume levels. I used ReplayGain to calculate the loudness of each song.
RAD Tools v0.8i was used to encode every single song since it retains more of the original audio quality than the newer versions of the RAD Tools do.
I also added the THPS HD soundtrack and a collection of songs from the iOS and Pocket PC versions of THPS2.
Enjoy!