A signal from a semi-randomly selected solder point within the shown video text generator is led through the Glitchduino using RCA cables. The signal runs through a photoresistor with a high electrical resistance when it is not exposed to light. No effect is visible. If a certain MIDI signal is recieved by the Arduino, a LED under the resistor is switched on or dimmed accordingly. The electrical resistance is lowered and an effect on the video output gets visible.