Examine the back of your MIDI keyboard and look for a small, round five-pin port with the words "MIDI In" printed above. If this port appears, you can send input to your MIDI keyboard. If your keyboard does not have a "MIDI In" port, you do not have the ability to transmit signals in this manner.
Connect a standard MIDI cable to the port, using either end of the cable. You can purchase a MIDI cable at most music or electronics supply stores. They are usually found among the instrument cables and other music peripherals.
Plug the opposite end of the cable into your output device (the instrument that sends the signals) using the "MIDI Out" port. You must use a MIDI instrument, like a digital synthesizer, because raw audio cannot translate to a MIDI environment, which relies on mathematical note programming.
Turn on your MIDI keyboard and your output device. On your MIDI keyboard, access your "Settings" menu by clicking the "Settings" or "Global" button. Some models have a "MIDI" button on the face of the keyboard, which you would select in such cases. When your settings appear on the LCD screen, verify that MIDI input is set to "On" or "Receive."
Play notes on your output device. As you click each key or push each button, the note translates to your MIDI keyboard in raw form. To designate a sound for the notes, select a preset from the sound bank on your MIDI keyboard, like a synth, brass or bass setting, for instance.