Sounds like you were talking about a knee control for your machine. I was raised on that type of a controller for my machines. I love it---I have a hard time with that big button on my machines to use my toe to control the machine. I loved the knee control. I have learned to use the foot control, but LOVED that other one. On my new fancy smancy machine---it has a knee lifter for the presser foot, but haven't really gotten used to it---because my knee is supposed to make the machine run, not lift the presser foot.
Sibyl