It will be unfair not to mention that the MIDI messages could be either MIDI CC or MIDI notes. This message is then sent to the said device using a MIDI or a USB cable. As long as you press a key on this keyboard or pad, you will have created a MIDI message. It will suffice to mention that this keyboard usually controls or commands a MIDI-equipped device. Ideally, MIDI is an acronym for Musical Instrument Digital Interface. You might consider it as a protocol whose role is to allow musical instruments, computers, and other hardware to communicate with ease. The MIDI controller keyboard is a communication tool that allows digital music to speak the same language. How to Connect Midi Keyboard to the Computer?.How to Get started with a MIDI Keyboard?.