Ok, bigger issue here. The variable I was remembering is "soundtracks" not "soundtrack". "soundtrack" references a python function within the old music player code. All I can do without me spending a ton of time just so you can try your old saves out (I really recommend you start from scratch due to the amount of changes since your old saves tbh), you can place the following inside your game folder and
maybe get things sorted. In theory it should work since it's just the old code which isn't used anymore anyway... no harm no foul.
- Delete that file you created before
- Extract the contents inside your "game" folder.
- Done, test.