MIDI stands for Musical Instrument Digital Interface .
Most computers have a midi outport that can connect a computer to an external midi instrument.
Moreover, a computer should have a soundcard and internal midi synthesizer installed in order to enable them playing back midi files. Midi versus other sound formats. Midi is the only sound format that contains no actual sound samples. Microsoft .wav files, Sun au. These contain performance information that refers to actual samples of sound that are used repeatedly in the playback of the file.