@WhimsicalWicker yeah, its estimated, basically vrcs default IK tracking but instead its smoother and more human, and yes you can use it with FBT to get estimated knees and elbows!
I was sent like 200+ photos in a file so here's the document lol
Read through and make your own decisions
As I won't tell you what to do lol
But this is a folder full of reasons why I recommend not interacting with themd
drive.google.com/drive/folders/…