what is the knob next to the control buttons ? it has a white pointer on it and turns around like a thermostst. where shoulld the white line be pointing? up - down - to the right or left when it's facing me? please respond quickly so i can use it properly. thank you.

ruth bussnick, January 2014

Knob! buttons! do we have to guess what hell you are on about,like make model etc

toptrish, January 2014