look, if a switch is closed it have just one state. a analog clock is a pulse wave with a pwm of 50% ... that means ON_ OFF_ON ... an so on .. if i use THAT type of state the leds run for the time the state is HIGH, if i use some buffering and rc filtering i get a TRIG impuls out of the gate pulsewave for every time a rising edge occurs. thats a very very short high state and that lets flash led AFTER led .. in that time the short TRIG occurs. .. without this filtering its a pure on/off pulsewave .. while the on state .. more leds rotate, with trig just once at a time
check the two lower periods