Repeater Bypass Tutorial
In the image above, the light is off, and both levers are off.
In this image, the lever turns on the light. This is the light that gets bypassed by the second repeater's signal.
As pictured here, the signal from the second lever alters the first repeater.
By turning on the first lever again, we can allow the repeater to hold the signal.
Turning off the first levers sustains the signal, since the second repeater's signal is effecting the first repeater.