Oh, that makes sense! Thank you so much for the answer.
I like using the knee control so I wouldn't put that button style foot control on the floor unless I was using the machine outside of its cabinet. E.g.: a 301 taken out of its cabinet to take to a class.
However, my knee controls are for a 201 and a 15-91 and I don't lug those out of the house unless they need repairs.
Thanks again Cathy and Joe.