Standalone VR headsetsmay be able to pair directly with VR trackers, while PC VR headsets will require that they be paired through SteamVR on a connected PC. VRChat should automatically detect any trackers you have successfully paired, but calibration ensures that your avatar follows their movement...
Facial tracking: Also known as lip tracking or mouth tracking, this lets your avatar copy your facial expressions and appear to speak in sync with you. It’s not natively available in VRChat but can be achieved via OSC on some VR headsets....