Keyboard controller

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A keyboard controller is musical keyboard instrument that does not produce any sounds of its own. It is like a keyboard synthesizer minus the synthesis circuits, or sound module. It sends MIDI note data electronically to an external sound module, another synthesizer, or even a computer or music sequencer. In this way a keyboard controller can be used to take the place of several separate instruments.

A controller is used to "play a computer" as the sound data is not on the actual controller. The controller uses data on a computer to create sound, hence the term, 'controller'. WIth the controller one controls his or her computer, and plays music through it.

Controllers come in many variations, and send out data through a MIDI cable or USB. THrough this the controller is connected directly to the computer, allowing the user to control the computer musically.