While devices typically do not produce an audio signal, any MIDI input can be combined with other MIDI sources to produce sound. MIDI also has considerable digital and analogue manipulation capabilities for the creation of and modification of sounds. Although MIDI is a native technology for controlling sound synthesizer, it is not well-suited for conventional acoustic instruments, as it does not support timbre and varies the pitch of the instrument for arbitrary intervals. MIDI can create most common musical notation signals including triads, fifths, and octaves. The notes are produced when a key is pressed, or a gate button is pushed, sending the resulting electrical signal to an amplifier to generate a pitch that is the audio amplitude of the note.

An example of a device that creates a MIDI note is an octave piano. A MIDI compatible instrument like the Roland FT-817 produces a MIDI note and plays it on its own devices or can copy it and play it on another instrument. MIDI-capable devices can send/receive data in several ways. Since the mid-1970s, many computers have incorporated one or more MIDI-compatible MIDI controller ports, which allowed musicians to control those devices (up to a MIDI keyboard and a MIDI drum machine) in real-time, using their MIDI-capable synthesizer, sequencer, sampler, etc.Ī musical instrument takes an input MIDI input signal, which can be as simple as an audio signal, and produces a MIDI output signal. Technically, MIDI is the file format of which standard MIDI-capable hardware is capable. It is used to connect a computer's MIDI input/output devices (keyboard, microphone, or mouse) to other hardware, often a musical instrument. MIDI is short for Musical Instrument Digital Interface and it is a standardized audio interface.

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