Midi pin numbers identificationPractical Usage The Cables and Connectors For Standard (Non-Usb) Midi ConnectionsIdentifying The Pins!A Special Case: 7 Pin Connectors!ExamplesMIDI connections generally use 5 pin DIN connectors. Two pins carry the MIDI signal; pin 4 is set at 5 Volts and pin 5 is the actual signal pin (set at 5 Volts but goes to zero when a bit is transmitted) is generally transmitted using 2 conductor cable. There is a shield and a twisted pair of signal conducting wires (twisted pair reduces external interference). Conforming to MIDI specs, the shield is connected to pin 2 at both ends. I use the CANARE L-2T2S cable to make my own cables if..See more on practicalusage MIDI Pin Out, Signal names, and MIDI Pinout Description 5-pin MIDI: MIDI Interface Bus; [Musical Instrument Digital Interface]: MIDI defines the electrical and physical interface over a 5-pin DIN connector, on a 64 ohm cable.MIDI also defines the protocol used over the interface, which happen to be digital instructions and not music.