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The Tracker Source is the piece of software, that determines the users head-pose and relays the values of the 6 axis (roll, pitch, yaw and x, y and z) to FaceTrackNoIR. FaceTrackNoIR v200 is 'modular', so new trackers can be easily added. Using the Tracker Source combo-box the Tracker can be selected. The description of each tracker and it's settings can be found in the FaceTrackNoIR Trackers section.
A second tracker can be used to, for instance, combine EDTracker data with real joystick data. Be sure to "check" the settings of the second tracker only for headpose-data you don't get from the first.