Although printing quality is not the best, the manual was very helpful in order to reactivate this ancient but still good electronic musical instrument.
Text excerpt from page 113 (click to view)
This feature will help you adjust the picture you are watching to give you the best possible picture quality.
4:3 - Use this aspect mode when you are watching a 4:3 broadcast. 16:9 - Use this aspect mode when you are watching a 16:9 broadcast. This is also referred to as "widescreen", for example on a DVD disc. When you select this mode, black bars will appear on the top and bottom of the TV screen.
16:9 - If you select 16:9 aspect mode while watching a 4:3 broadcast, this will stretch the picture so as to fit into the 16:9 format. When you select this mode, black bars will appear on the top and bottom of the TV screen.
HD ZOOM - If you are watching a 4:3 high definition broadcast and you select this aspect mode, it will zoom in on the picture.
V STRETCH - If you are watching a 4:3 broadcast, this aspect mode will stretch the picture vertically on your TV