Abstract: A control system for the control of special functions in multiple projector systems is disclosed. The system can effect fading, blending and mixing at different speeds in forward and reverse projector directions. The system includes a freely programmable memory, such as a cross-bar distributor for storing program instructions. The program memory may be modified by changing the location of plug-in diodes at cross-over points between rows and columns of the cross-bar distributor. A selector is provided for extracting a portion of the programmed memory. The selector may include an automatic portion such as a stepping switch for changing the portion of the program selected. The selector provides binary coded signals representative of program instructions to a decoder. The decoder decodes the digital signals and provides control signals for effecting control of the light sources in each projector. The decoder includes a different charge-discharge circuit for each projector.