Knobs can be dragged either vertically or horizontally.
Buttons only send two values, the lowest and highest of their range set in the Object inspector. You change a button’s state by clicking it.
The default appearance of the text fader is like a value field that can be scrolled. Double-click to open a window and enter text for each menu position. Select the Behaves as Menu checkbox to use the text fader as a pop-up menu.
A vector fader allows you to scroll in two directions, and sends out two values: one corresponding to the vertical position, and the other to the horizontal position.