Multi-Level Keyer was made for manipulation with more image layers. While ordinary tools of the time provided two-layered input, the resulting analogue tool made it possible to work with six inputs at the same time. The tool, consisting of digital “key priority encoder” combined with analogue keyers/mixers, receives and lines up single inputs and places them in image layers with various space relationships. In real time it was possible to “cut out” parts of the images and replace them with new ones. The user chooses the boundary brightness level and parts of the image above or below this level are replaced by different image input.