Perhaps I have the wrong name on the machine, but I thought it was the Abductor. You sit on a seat with your chest agaist the padded surface - it has 2 hand grips behind and you simply bend forward from the waist. I'll check on the name tomorrow.
I'm not sure what you mean by "compound leg exercieses." Concering the other exercises, we have the machine you are describing, I believe, but usually avoid - opening and closing legs.
RE: Leg Extension and Leg Curl. I was avoiding them because I was concerned they might aggravate the arthritis in my knees. Right now knees are doing well, minimum pain, walking is OK. Are these approriate with arthritis?