The Testing module breaks out into each color-channel, horizontal and vertical -video sync. The picture coming from the tester can be changed using a gate signal trough an external mini jack.
Additional modules made from logic-chips, filters and a oscillator, can be used to distort and twist the video signals. External manipulation can be done through mini jacks in the modules.
All channels are being mixed together and outputted tough a VGA-connector at the end, for connecting to a compatible video monitor.