[ship log!] It’s moments like this for which I’m alive. This has literally brought me to tears of happiness 🥹. Used a stem separator (htdemucs_6s by Meta research) to separate a song into it’s parts (guitar, drums, piano, other, bass, vocals) and spatialises them individually, placing the stems around the listener to make the song sound more open; as if the members of a band are playing around the listener. It worked EXCEPTIONALLY well, far beyond what I expected, even for songs I used to stress test it which were almost guaranteed to sound bad, they sounded great. The spatialiser asks for song file path, room size, and distance of source. The materials of the room can be altered by changing the alpha coefficients. Here are a few songs I tried out and their review:

Bill Withers - Ain’t no Sunshine: a very safe song for first try, clear separation of instruments, no stereo widening or spatialisation, no special effects. Genuinely shocked me, made me smile uncontrollably when it played. Sounded perfect, spatialised well (everything was distinguishable). Truly sounded “outside of head” and around me. Exactly the kind of song this was built to fix; flat and closed songs sounding open.
Ye - This a Must: from my fav artist. A song I’ve liked but disliked the closed, flat feeling of vocals in. This didn’t work just as well as others. Lost a bit of thump initially, but reducing distance helped. This also did exactly what I wanted, though it still lacked some thump.
Olivia Rodrigo - stupid song: A song i love because of the layering of instruments and her vocals. I used this to see what would happen in a song with a lot of stereo widening and effects already present. This sounded beautiful here, and I was concerned about it having clashing effects, but that didn’t happen. amazing.
Playboi Carti - POP OUT: I put this in as a joke, there was no way this was supposed to sound tolerable. But it blew me away, and worked really well, dare I say better than the original too?
Others: Jeremy Zucker - i dont know you, Stevie Wonder - Sir Duke, Carti - TOXIC

Demo videos: https://youtu.be/GdZYN0wQXBQ