Eyebrows

Hi All,

Need assistance please. 

There was a video/clip on YouTube that explained how to create swap sets, using keyframes and triggers for eyebrows. It was very informative and allowed me to ustlise the eybrows on my character using the keyboard. 

I'm prety sure it was on here https://www.youtube.com/watch?v=VhCKD5vl848&t=2988s however I cannot loacte the eyebrow explainer anywhere? Its very brief in this particular video/link, as it doesn't go into detail on how to set it up. 
 
Thank you