5.13: MIDI and Its Use

MIDI and Its Use

MIDI (Musical Instrument Digital Interface) is a protocol for transmitting musical performance data, not sound. It communicates:

• Notes, pitch, velocity
• Control changes (mod wheel, sustain pedal, volume)
• Synchronization data (Midi Time Code or MTC)

History of MIDI

MIDI was developed in the early 1980s by a group of synthesizer manufacturers led by Roland, Sequential Circuits, Yamaha, and Korg. It was officially introduced in 1983 at the NAMM show, where two synthesizers from different companies successfully communicated with one another via MIDI.

The creation of MIDI solved a major problem in the music industry: before its adoption, instruments and devices from different manufacturers could not easily communicate. MIDI provided a universal standard for control, allowing musicians to connect various synthesizers, drum machines, sequencers, and later computers.

Music and Genres That Extensively Used MIDI

MIDI revolutionized the 1980s and 1990s music landscape, particularly in genres like:

• Electronic music (synthpop, techno, house, trance)
• Pop and rock (integration of synthesizers and drum machines)
• Film scoring (virtual orchestration and sequencing)
• Hip-hop and R&B (samplers and MIDI drum machines became foundational tools)

MIDI made it possible for musicians to program complex arrangements, layer sounds, and synchronize multiple instruments with precision.

Relation to Modern Synthesizers

Modern synthesizers still rely heavily on MIDI. Whether hardware or software-based, they use MIDI data to trigger sounds, adjust parameters, and sync with DAWs. Virtual instruments (VSTs) inside DAWs also use MIDI to simulate anything from classic analog synths to full orchestras.

Examples of MIDI Instruments

• E-Drums (Electronic Drum Kits) – drum pads trigger sampled or synthesized drum sounds.
• E-Guitars and MIDI Guitar Controllers – convert string vibrations into MIDI data for triggering synths.
• MIDI Keyboards/Controllers – the most common, used to play virtual instruments.
• MIDI Electronic Wind Instrument (EWI) – simulate saxophones, flutes, or other wind instruments for electronic use.

MIDI Cables and Modern Connections

Traditionally, MIDI devices were connected using a 5-pin DIN MIDI cable, with separate ports for MIDI In, MIDI Out, and MIDI Thru. These cables only transmit digital control data, not audio.

In modern setups, USB connections have largely replaced traditional MIDI cables. USB provides faster, bi-directional communication between instruments and computers, reducing the need for specialized interfaces. Many contemporary MIDI controllers (keyboards, drum pads, and wind controllers) connect directly to a computer or DAW via USB, while still offering the 5-pin DIN ports for compatibility with older hardware.