Relay events still kinda confuse me to this day - always gotta ask around for help with em'
they are quite simple really. say you want a brick to play a sound every 5 seconds or so, you'd do the following events
onRelay>Self(or named brick)>playSound>Sound
onActivate>Self>fireRelay
onRelay>Self>fireRelay (set this one to 5000 for delay)
you can do this with any event, just replace playsound with whatever you want. it doesnt have to be just one event, it could do multiple things at the same time every relay