A Main Menu item is opened with <alt>+X, where X is the underlined letter in the item name. <Alt>+f, for example, opens the File menu. Once opened, <alt>+X selects an item, or the arrow keys can be used to travel around the menu. <Enter> selects the highlighted item.
The <Tab> key moves from item to item in the main window and in dialogs; <Shift><Tab> moves in the opposite direction. The arrow keys move around the organ panel. A checkbox or button that has the focus-denoted by a rectangle around the item-is selected by the spacebar. The <F5> function key, serving the same function as the right mouse button, brings up the detail dialog in the organ panel. <F4> shows a pull down menu. The arrow and <Page Up> and <Page Down> keys move the slider. The arrow keys move among a group of radio boxes.