Oh....I got some Sansui button pressing for ya.
This how it was done in 1983.
Make sure you follow this method to best enjoy your Sansui products.
The woman dancing here is Roberta Mathes and she has a blog / online memoir of her career.
There she writes about the Sansui gig saying, “...at the audition we were required to dance around the sansuii stereo system, “soutenu” and turn it on. ironically, i treated myself to a manicure earlier that day and was thankful; they focused the camera right on my hands and fingers. i booked the commercial and i attributed it to my newly polished nails.”