The connection between the key and the pipe valve, called the "action" of the organ, can be achieved by mechanical or electrical means. In a mechanical action instrument long rods or "trackers" pull down the valves under the pipes.
				Obviously the keyboards must be close to the pipe valves or the action may be hard to play. Usually the keyboards and pipes are all built in a case with the pipes directly above and in front of the player. The best thing about mechanical action is that the player can feel the opening of the pipe valves and can make different kinds of attacks and releases by pressing and releasing the key slowly or quickly. Until electricity was discovered, all organs used trackers to connect the keys to the pipes. Today, many builders make mechanical action instruments.