Synapse seems limited to single user, plus a lot of my visual material is in Processing so I decided to jump into hacking into the kinect through processing itself and bypassing Synapse. Using SimpleOpenNI libraries and code from Jon Bellona, I managed to track the skeleton (as well as identify multiple users) The one issue I'm having is of the skeleton not being steady, so I'll need to implement some sort of smoothing function (possibly a moving average or so)