Besides pan and tilt zactrack automatically controls 4 additional fixture channels in relation to the distance between actor and fixture. These 4 channels are “Dimmer”, “Iris”, “Focus” and “Zoom”. To program the auto functions you just “show” zactrack what to do. Point the light to a specific keyposition on the stage and adjust the channel settings as you desire. Store the settings for this keyposition and do so for at least 3 other points (or even more). As the actor now moves on the stage inbetween these keypositions the cahnel values will be smoothly interpolated.