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Music sequencer

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A music sequencer is a specialized device or software application used to record, edit, and play back musical information.

Sequential Circuits Six-Trak front
Sequential Circuits Six-Trak front

Instead of just recording raw sound waves, a sequencer typically manages note and performance data. This data is transmitted through various protocols, such as MIDI (Musical Instrument Digital Interface), CV/Gate (Control Voltage/Gate), or Open Sound Control. Modern digital audio workstations, or DAWs, often use sequencers to manage automation data and software plug-ins. These tools are essential because they allow musicians to organize complex patterns of notes and timing with high precision.

Cubase6 main audio tracks
Cubase6 main audio tracks

Sequencers function through different technical mechanisms depending on their design. An analog sequencer uses analog electronics to process musical notes. Users often interact with these devices using physical knobs or sliders to adjust the notes for each step in a sequence. In contrast, a step sequencer organizes musical notes into equal time intervals, or steps.

Fairlight II Page R
Fairlight II Page R

On a drum machine, a user might select a trigger timing from a row of step buttons. On a bass machine, a musician might select a specific note from a chromatic keypad and then assign a duration to that step. Realtime sequencers function more like traditional audio recorders. They capture musical notes exactly as they are performed, allowing for specific tempo settings and pitch control.

Sequential Circuits Six-Trak front
Sequential Circuits Six-Trak front

There are several distinct types of sequencers categorized by how they handle data and their physical construction. MIDI sequencers focus on managing MIDI data, which is the standard for digital musical communication. Analog sequencers use CV/Gate data to control electronic instruments. In a DAW environment, sequencers might handle automation data for mixing or manage software effect plug-ins. Audio sequencers, such as grooveboxes or loop-based software, handle actual audio data.

Akai MPC60
Akai MPC60

Software sequencers are highly flexible and are often integrated into music authoring environments. They provide various interfaces, such as a piano roll editor for visual note manipulation or a numerical editor for precise data entry.

Cubase6 Key Editor piano roll with Note Expression
Cubase6 Key Editor piano roll with Note Expression

The history of sequencing begins with ancient mechanical musical instruments. As early as the 9th century, the Banū Mūsā brothers in Persia created a hydropowered organ using exchangeable cylinders with pins. They also developed an automatic flute-playing machine powered by steam, which was the first programmable music sequencer.

In 1206, the Arab engineer Al-Jazari invented programmable musical automata. This "robot band" included a drum machine that used pegs, or cams, to bump into levers and operate percussion. This allowed for different rhythms and drum patterns to be played by moving the pegs. Later, in the 14th and 15th centuries, rotating cylinders with pins were used for carillons and barrel organs in Europe.

During the Industrial Revolution, technological advances led to more widespread automatic instruments. These included music boxes, barrel organs, and player pianos that used punched-hole music rolls.

This method of using punched media continued into the mid-20th century with programmable synthesizers like the RCA Mark II in 1957. The 20th century also saw the rise of "drawn sound" techniques. In the 1930s and 1950s, inventors like Yevgeny Sholpo and Daphne Oram used hand-drawn waveforms on film to trigger sound. This technique acted as a precursor to the modern graphical user interfaces used in DAWs today.

Electronic sequencing evolved rapidly through the work of individual inventors and early computer science. In the 1940s and 1950s, American composer Raymond Scott developed several electro-mechanical sequencers. His "Wall of Sound" used stepping relays, solenoids, and tone circuits to produce rhythmic patterns.

Roland TR-808 drum machine
Roland TR-808 drum machine

Computer-based music also emerged during this era. In 1951, the CSIRAC computer in Australia played the first computer music.

CSIRAC-Pano,-Melb.-Museum,-12.8.2008
CSIRAC-Pano,-Melb.-Museum,-12.8.2008

By 1957, Max Mathews at Bell Labs wrote MUSIC, which was the first widely used program for sound generation. These early experiments moved from massive mainframe computers to the microcomputers and software-based systems used by musicians today.

Today, the sequencing landscape is dominated by software, though hardware remains important for specific uses. Most modern musicians use software sequencers within a DAW to manage complex studio environments.

Cubase 6 feature - software studio environment including software instruments and software effects
Cubase 6 feature - software studio environment including software instruments and software effects

These software tools can control virtual instruments, allowing musicians to replace large, expensive hardware synthesizers with software equivalents. However, hardware sequencers are still found in workstation keyboards, drum machines, and grooveboxes. While the demand for standalone hardware MIDI sequencers has decreased, these built-in tools remain vital for live performance and specific rhythmic workflows.

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🖼️ Images & Media (27)
File:Korg SQ-10.JPG
Korg SQ-10.JPG
File:Sequential Circuits Six-Trak front.png
Sequential Circuits Six-Trak front.png
File:Cheesetracker-shot.png
Cheesetracker-shot.png
File:Cubase6 Score Editor.png
Cubase6 Score Editor.png
File:Cubase6 Key Editor piano roll with Note Expression.jpg
Cubase6 Key Editor piano roll with Note...
File:Cubase6 main audio tracks.jpg
Cubase6 main audio tracks.jpg
File:Cubase 6 feature - software studio environment including software instruments and software effects.svg
Cubase 6 feature - software studio...
File:Cubase6 LoopMash 2 loop remixer (brighten).jpg
Cubase6 LoopMash 2 loop remixer (brighten).jpg
File:Cubase6 Sample Editor beat slicing.jpg
Cubase6 Sample Editor beat slicing.jpg
File:Cubase6 VariAudio vocal pitch editing.jpg
Cubase6 VariAudio vocal pitch editing.jpg
File:Polyphonic note separation & manipulation.jpg
Polyphonic note separation & manipulation.jpg
File:Ardour-screenshot-big (tracks, mixer, x-fade - brighten).jpg
Ardour-screenshot-big (tracks, mixer,...

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