Okay, so before anyone says anything about it, I just realized that the file name for 3DS Piranha Plant Slide (Underground) uses the course's British-English name of 3DS Piranha Plant Pipeway by mistake. I honestly have no idea how that slipped by me or why it was ever called that to start with because fun fact: I'm not British.
Side note, I have no clue why Berlin Byways still has the "2" after it since I very distinctly remember changing it from Berlin Byways 1-2 to just Berlin Byways, and yet somehow it ended up as neither...
Anyways, that'll all probably be fixed whenever I next need to update the soundtrack, so until then... <insert creative joke here>