Source: Wikipedia. Pages: 24. Chapters: Analog sequencer, Band-pass filter, Band-stop filter, Digital filter, High-pass filter, Low-frequency oscillation, Low-pass filter, Music sequencer, Variable-gain amplifier, Voltage-controlled filter, Voltage-controlled oscillator. Excerpt: A music sequencer (or simply sequencer) is a device or application software that can record, edit, or play back music, by handling note and performance information in several forms, typically MIDI or CV/Gate, and possibly audio and automation data for DAWs and plug-ins. As mentioned above, music sequencers are often categorized by handling data types, as following: Also, music sequencer can be categorized by its construction and supporting modes. Realtime sequencer (realtime recording mode) A realtime sequencer on the synthesizerRealtime sequencer records the musical notes in real-time as on audio recorders, and play-back musical notes with designated tempo, quantizations, and pitch. For editing, usually "punch in/punch out" feature originated in the tape recording is provided, although it requires enough skills to obtain desired result. For detailed editing, possibly another visual editing modes under graphical user interface may be more suitable. Anyway, this mode provides usability similar to the audio recorder already familiarized by musicians, and it is widely supported on software sequencer, DAW, and built-in hardware sequencers.Analog sequencer An analog sequencerAnalog sequencers are typically implemented with analog electronics, and play the musical notes designated by a series of knobs or sliders corresponding to each musical note (step). It is designed for both composition and live performance; users can anytime change the musical notes without regarding recording mode. And also possibly, the time-interval between each musical note (length of each step) can be independently adjustable. Typically, analog sequencer is used to generate the repeated minimalistic phrases which is reminiscent of Tangerine Dream, Giorgio Moroder or trance music.Step sequencer (step recording mode) A step sequencer on the drum machineOn the step sequencers, musical notes are rounded into the steps with equal time-interval, and users can enter each musical note without exact timin