Add looping sound effect to a machine?

I made a pulverizing machine that just chews up ore to make a crushed variant, both the off and on versions of the blocks have a tick rate of 1 (set up like a furnace). How would I go about setting up a looping sound effect that would only run while its on? I see there is a way to play sound but not a way to kill the sound, and with a tick rate of 1 the sound plays way too many times lol. I'm still new to creating procedures.