Music sequencer
From The Art and Popular Culture Encyclopedia
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A music sequencer (also MIDI sequencer or just sequencer) is software or hardware designed to create and manage computer-generated music.
Originally, music sequencers did not include the ability to record audio. Instead, they managed control information (such as control voltage or note on/off commands) to be sent to electronic musical instruments to produce audio output. Most modern sequencers now feature audio editing and processing capabilities as well. Consequently, the terms "music sequencer" and "digital audio workstation" are often used interchangeably.
Although the term "sequencer" is today used primarily for software, some hardware synthesizers and almost all music workstations include a built-in MIDI sequencer. Drum machines generally have a step sequencer built in. There are still also standalone hardware MIDI sequencers, though the market demand for those has diminished greatly in the last ten years.
Many sequencers have features for limited music notation, and most are able to show music in a piano roll notation. (For software designed specifically for music notation, see scorewriter.)
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