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AutoChanger changer.htm  - This AutoChanger sets the number of increments after which a background picture will overlay. Opp.Click on the changer bar itself disables / enables the counter whereas on this slider  toggles between the KarmaGun routine and 3D perturbation mode.

When the value of this autochanger scrollbar on the left of the Stand control is not zero then its value will be used to determine how many rotation increments are to take place before the next image in the PictureList is selected, assuming there is a list of pictures. The value of the autochanger scrollbar becomes the caption of the Stand checkbox when it is not zero. When autozoom is inactive, if the value of the autochanger is zero then, while the plot is rotating, the background picture is not automatically changed and you need to use the Forward or Prev commands to manually change pictures.