About turning on and off pulse by key

Hi guys,
pretty noobish question…
I got a pulse that randomly shuffles between colors.
I want to make a key that when you hold it, it’s running when you not holding it … its stops on color at that moment,
and when I push it run again

i added a file of the example i talking about
big thanks
randomTopSwitcher.2.toe (4.3 KB)