DIN Connector -Deutsch Industrien Normen. Of the five pins, only three are generally used. Their cost is included in that of the MIDI Cable. Finally, there are controllers that don't resemble traditional instruments at all. In one way or another, most controllers translate a traditional performance technique into binary code that represents a MIDI event.
Some controllers only send out data, while others include integrated tone modules.
Although most people think first of the little black boxes that store sounds but don't include integrated controllers, most keyboards have integrated tone modules within their cases. The tone module is where the sounds of a MIDI device are stored. You retrieve them by pushing one or more buttons or by turning a dial on the device. Most tone modules are connected to an audio system, but some have integrated amplifiers and speakers. Controllers send MIDI data out the OUT Port.