Editing MIDI controller

{{Short description|Device that produces MIDI data}}
{{Use American English|date=January 2020}}

[[File:Roland AX-1 keytar midi controller.JPG|thumb|A Roland [[keytar]],  keyboard MIDI controller designed to be worn with a shoulder strap during performance. The keytar does not produce any musical sounds by itself. As a MIDI controller, it only sends data about which keys or buttons are pressed to a MIDI-compatible [[sound module]] or [[synthesizer]], which then produces the sounds.]]

A '''MIDI controller''' is any hardware or software that generates and transmits Musical Instrument Digital Interface ([[MIDI]]) data to MIDI-enabled devices, typically to trigger sounds and control parameters of an electronic music performance. They most often use a [[musical keyboard]] to send data about the pitch of notes to play, although a MIDI controller may trigger lighting and other effects. A [[wind controller]] has a sensor that converts breath pressure to volume information and lip pressure to control pitch.  Controllers for percussion and stringed instruments exist, as well as specialized and experimental devices.  Some MIDI controllers are used in association with specific [[digital audio workstation]] software.  The original MIDI specification has been extended to include a greater range of control features.

==Features==
MIDI controllers usually do not create or produce musical sounds by themselves. MIDI controllers typically have some type of interface that the performer presses, strikes, blows or touches. This action generates MIDI data (e.g. notes played and their intensity), which can then be transmitted to a MIDI-compatible [[sound module]] or [[synthesizer]] using a MIDI cable. The sound module or synthesizer in turn produces a sound that is amplified through a [[loudspeaker]].

The most commonly used MIDI controller is the electronic [[musical keyboard]] MIDI controller. When the keys are played, the MIDI controller sends MIDI data about the pitch of the note, how hard the note was played and its duration. Other common MIDI controllers are [[wind controller]]s, which a musician blows into and presses keys to transmit MIDI data, and [[electronic drums]].

The MIDI controller can be populated with any number of sliders, knobs, buttons, pedals and other sensors, and may or may not include a piano keyboard. Many [[audio control surface]]s are MIDI-based and so are essentially MIDI controllers.

While the most common use of MIDI controllers is to trigger musical sounds and play musical instruments, MIDI controllers are also used to control other MIDI-compatible devices, such as stage lights, digital [[audio mixer]]s and complex guitar [[effects unit]]s.

==Types (hardware and software )==
{{unreferenced section|date=June 2019}}
[[File:Roland Octapad II Pad-80.jpg|thumb|The [[Roland Octapad]] percussion/drum controller]]
The following are classes of MIDI (Musical Instrument Digital Interface) controller:

*The human interface component of a traditional instrument redesigned as a MIDI control device. The most common type of device in this class is the keyboard controller. Such a device provides a [[musical keyboard]] and perhaps other actuators (pitch bend and modulation wheels, for example) but produces no sound on its own. It is intended only to drive other MIDI devices. Percussion controllers such as the [[Roland Octapad]] fall into this class, as do a variety of wind controllers and guitar-like controllers such as the [[SynthAxe]].
*[[Electronic musical instrument]]s, including [[synthesizer]]s, [[sampler (musical instrument)|sampler]]s, [[drum machine]]s, and [[electronic drum]]s, which are used to perform music in real time and are inherently able to transmit a MIDI data stream of the performance.
*Pitch-to-MIDI converters including [[guitar/synthesizer]]s analyze a pitch and convert it into a MIDI signal. There are several devices that do this for the human voice and for monophonic instruments such as flutes, for example.
*Traditional instruments such as [[drum kit|drum]]s, acoustic [[piano]]s, and [[accordion]]s which are outfitted with sensors and a computer processor which accepts input from the sensors and transmits real-time performance information as MIDI data. The performance information (e.g., on which notes or drums are struck, and how hard) is then sent to a module or computer which converts the data into sounds (e.g., samples or synthesized sounds).
*[[music sequencer|Sequencer]]s, which store and retrieve MIDI data and send the data to MIDI-enabled instruments in order to reproduce a performance.
*[[MIDI Machine Control]] (MMC) devices such as recording equipment, which transmit messages to aid in the synchronization of MIDI-enabled devices. For example, a recorder may have a feature to index a recording by measure and beat. The sequencer that it controls would stay synchronized with it as the recorder's transport controls are pushed and corresponding MIDI messages transmitted.
*[[MIDI Show Control]] (MSC) devices such as show controllers, which transmit messages to aid in the operation and cueing of live theatrical and themed entertainment productions.  For example, a variety of [[show control]] sub systems such as sound consoles, sound playback controllers, virtual audio matrices and switchers, video playback systems, rigging controllers, pyro and lighting control systems directly respond to MSC commands.   However, most standalone generic MSC controllers are intended to actuate a generic computerized show control system that has been carefully programmed to produce the complex desired results that the show demands at each moment of the production.

==Performance controllers==
[[File:Remote 25.jpg|thumb|alt=A Novation Remote 25 two-octave MIDI controller|Two-octave MIDI controllers are popular for use with laptop computers, due to their portability. This unit provides a variety of real-time controllers, which can manipulate various sound design parameters of computer-based or standalone hardware instruments, effects, mixers and recording devices.]]
MIDI was designed with keyboards in mind, and any controller that is not a keyboard is considered an "alternative" controller.<ref>{{cite web |url=http://www.midi.org/aboutmidi/products.php |title=MIDI Products |website=midi.org |publisher=MIDI Manufacturers Association |archive-url=https://web.archive.org/web/20120823030324/http://www.midi.org/aboutmidi/products.php |archive-date=2012-08-23}}</ref> This was seen as a limitation by composers who were not interested in keyboard-based music, but the standard proved flexible, and MIDI compatibility was introduced to other types of controllers, including guitars, wind instruments and drum machines.<ref name="Holmes">{{cite book |title=Electronic and Experimental Music: Pioneers in Technology and Composition |first=Thom |last=Holmes |isbn=9780415936446 |lccn=84026715 |series=Media and Popular Culture Series |url=https://books.google.com/books?id=ILkquoGXEq0C |date=2002 |publisher=Routledge}}</ref>{{rp|23}}

===Keyboards===
{{main|MIDI keyboard}}
[[Musical keyboard|Keyboard]]s are by far the most common type of MIDI controller.<ref name="Cakewalk">{{cite web |url=http://www.cakewalk.com/support/kb/reader.aspx/2007013074 |title=Desktop Music Handbook&nbsp;– MIDI |website=cakewalk.com |publisher=Cakewalk, Inc |date=26 November 2010 |access-date=7 August 2012 |archive-date=14 August 2012 |archive-url=https://web.archive.org/web/20120814222211/http://www.cakewalk.com/Support/kb/reader.aspx/2007013074 |url-status=dead }}</ref> These are available in sizes that range from 25-key, 2-octave models, to full-sized 88-key instruments. Some are keyboard-only controllers, though many include other real-time controllers such as sliders, knobs, and wheels.<ref>{{cite web|title=The beginner's guide to: MIDI controllers|date=29 October 2008|url=http://www.musicradar.com/tuition/tech/the-beginners-guide-to-midi-controllers-179018|publisher=Computer Music Specials|access-date=11 July 2011}}</ref> Commonly, there are also connections for [[Sustain pedal|sustain]] and [[expression pedal]]s. Most keyboard controllers offer the ability to split the playing area into ''zones'', which can be of any desired size and can overlap with each other. Each zone can be assigned to a different MIDI channel and can be set to play any desired range of notes. This allows a single playing surface to control a number of different devices.<ref name="Huber">Huber, David Miles. "The MIDI Manual". Carmel, Indiana: SAMS, 1991.</ref>{{rp|79–80|date=November 2012}} MIDI capabilities can also be built into traditional keyboard instruments, such as [[grand piano]]s<ref name="Huber" />{{rp|82|date=November 2012}} and [[Rhodes piano]]s.<ref>{{cite magazine |url=http://www.keyboardmag.com/article/Rhodes-Mark-7/1896 |title=Rhodes Mark 7 |website=keyboardmag.com |publisher=New Bay Media |access-date=7 August 2012 |archive-url=https://web.archive.org/web/20150713034839/http://www.keyboardmag.com/article/Rhodes-Mark-7/1896 |archive-date=13 July 2015 |url-status=dead }}</ref> [[Pedal keyboard]]s can operate the pedal tones of a MIDI organ, or can drive a [[bass synthesizer]].

[[File:Onyx The Digital Pied Piper.jpg|thumb|left|alt=A performer playing a MIDI wind controller|Onyx Ashanti playing a MIDI wind controller, which can produce expressive, natural-sounding performances.]]

===Wind controllers===
{{main|Wind controller}}
Wind controllers allow MIDI parts to be played with the same kind of expression and articulation that is available to players of wind and brass instruments. They allow breath and pitch glide control that provide a more versatile kind of phrasing, particularly when playing sampled or [[Physical modelling synthesis|physically modeled]] wind instrument parts.<ref name="Huber" />{{rp|95|date=November 2012}} A typical wind controller has a sensor that converts breath pressure to volume information and may allow pitch control through a lip pressure sensor and a pitch-bend wheel. Some models include a configurable key layout that can emulate different instruments' fingering systems.<ref>White, Paul. "[http://www.soundonsound.com/sos/jul98/articles/yamwx5.html Yamaha WX5]". ''Sound On Sound''. SOS Publications. Jul 1998. Print.</ref> Examples of such controllers include [[Akai]]'s [[EWI (musical instrument)|Electronic Wind Instrument]] (EWI) and Electronic Valve Instrument (EVI). The EWI uses a system of keypads and rollers modeled after a traditional [[woodwind instrument]], while the EVI is based on an acoustic [[brass instrument]], and has three switches that emulate a [[trumpet]]'s valves.<ref name="Manning">Manning, Peter. ''Electronic and Computer Music''. 1985. Oxford: Oxford University Press, 1994. Print.</ref>{{rp|320–321|date=November 2012}} 

Simpler breath controllers are also available. Unlike wind controllers, they do not trigger notes and are intended for use in conjunction with a keyboard or synthesizer.<ref>{{cite web |title=Breath Controller |url=https://www.sweetwater.com/insync/breath-controller/ |date=Aug 14, 2003 |publisher=Sweetwater |access-date=2020-01-14}}</ref>

===Drum and percussion controllers===
[[File:V-drums-2.jpg|thumb|right|alt=A MIDI drum kit|Drum controllers, such as the [[Roland V-Drums]], are often built in the form of an actual drum kit. The unit's sound module is mounted to the left.]]
Keyboards can be used to trigger drum sounds, but are impractical for playing repeated patterns such as rolls, due to the length of key travel. After keyboards, drum pads are the next most significant MIDI performance controllers.<ref name="Manning" />{{rp|319–320|date=November 2012}} Drum controllers may be built into drum machines, may be standalone control surfaces, or may emulate the look and feel of acoustic percussion instruments. MIDI triggers can also be installed into acoustic drum and percussion instruments. The pads built into drum machines are typically too small and fragile to be played with sticks, and are played with fingers.<ref name="Huber" />{{rp|88|date=November 2012}} Dedicated drum pads such as the [[Roland Octapad]] or the [[DrumKAT]] are playable with the hands or with sticks. There are also percussion controllers such as the [[vibraphone]]-style [[MalletKAT]],<ref name="Huber" />{{rp|88–91|date=November 2012}} and [[Marimba Lumina]].<ref>{{cite web |url=http://www.buchla.com/mlumina/description.html |title="Marimba Lumina Described". ''buchla.com''. n.p. n.d. Web |publisher=Buchla.com |access-date=2012-11-27 |url-status=dead |archive-url=https://web.archive.org/web/20121101162651/http://www.buchla.com/mlumina/description.html |archive-date=2012-11-01 }}</ref> Pads that can trigger a MIDI device can be homemade from a [[piezoelectric sensor]] and a practice pad or other piece of foam rubber.<ref>White, Paul. "[http://www.soundonsound.com/sos/1995_articles/aug95/diydrumpads.html DIY Drum Pads And Pedal Triggers]". ''Sound On Sound'' SOS Publications. Aug 1995. Print.</ref>

===Stringed instrument controllers===
A guitar can be fitted with special [[Pickup (music technology)|pickups]] that digitize the instrument's output and allow it to play a synthesizer's sounds. These assign a separate MIDI channel for each string, and may give the player the choice of triggering the same sound from all six strings or playing a different sound from each.<ref name="Huber" />{{rp|92–93|date=November 2012}} Some models, such as Yamaha's G10, dispense with the traditional guitar body and replace it with electronics.<ref name="Manning" />{{rp|320|date=November 2012}} Other systems, such as Roland's MIDI pickups, are included with or can be retrofitted to a standard instrument. Max Mathews designed a MIDI violin for [[Laurie Anderson]] in the mid-1980s,<ref>Goldberg, Roselee. ''Laurie Anderson''. New York: Abrams Books, 2000. p.80</ref> and MIDI-equipped violas, cellos, contrabasses, and mandolins also exist.<ref>Batcho, Jim. "Best of Both Worlds". ''Strings'' 17.4 (2002): n.a. Print.</ref> Other string controllers such as the [[c:File:Starr Labs Ztar Z6 series (drvinay's studio).jpg|Starr Labs Ztar]] use a combination of fretboard keys and strings to trigger notes without needing a MIDI pickup.

[[File:Akai SynthStation 25.jpg|thumb|alt=A MIDI controller for use with a [[smartphone]]|A MIDI controller designed for use with a [[smartphone]]. The phone docks in the center.]]

===Specialized and experimental controllers===
[[DJ digital controller]]s may be standalone units or may be integrated with a specific piece of software. These typically respond to MIDI clock sync and provide control over mixing, looping, effects, and sample playback.<ref>Price, Simon. "[http://www.soundonsound.com/sos/sep06/articles/allenheathxone.htm Allen & Heath Xone 3D]". ''Sound On Sound''. SOS Publications. Sep 2006. Print.</ref>

MIDI triggers attached to shoes or clothing are sometimes used by stage performers. The Kroonde Gamma wireless sensor can capture physical motion as MIDI signals.<ref>{{cite journal|citeseerx = 10.1.1.84.8862|title=Wireless gesture controllers to affect information sonification|first=Kirsty|last=Beilharz}}</ref> Sensors built into a dance floor at the [[University of Texas at Austin]] convert dancers' movements into MIDI messages,<ref>{{cite journal | last1 = Pinkston | last2 = Kerkhoff | last3 = McQuilken | title = The U. T. Touch-Sensitive Dance Floor and MIDI Controller | publisher = The University of Texas at Austin | date = 10 August 2012 }}</ref> and [[David Rokeby]]'s ''Very Nervous System'' [[art installation]] created music from the movements of passers-through.<ref>Cooper, Douglas. "[https://www.wired.com/wired/archive/3.03/rokeby.html Very Nervous System]". ''Wired''. Condé Nast. 3.03: Mar 1995.</ref> Software applications exist which enable the use of [[iOS]] devices as gesture controllers.<ref>"[https://web.archive.org/web/20121022175309/http://midiinmotion.fschwehn.com/the-glimpse/ The Glimpse]". ''midiinmotion.fschwehn.com''. n.p. n.d. Web. 20 August 2012</ref>

Numerous experimental controllers exist which abandon traditional musical interfaces entirely. These include the gesture-controlled [[Buchla Thunder]],<ref>{{cite web |url=http://www.buchla.com/historical/thunder/ |title="Buchla Thunder". ''buchla.com''. Buchla and Associates. n.d. Web |publisher=Buchla.com |access-date=2012-11-27 |url-status=dead |archive-url=https://web.archive.org/web/20121101162647/http://www.buchla.com/historical/thunder/ |archive-date=2012-11-01 }}</ref> sonomes such as the C-Thru Music Axis,<ref>"[http://www.midi.org/aboutmidi/products.php#NonTrad MIDI Products] {{Webarchive|url=https://web.archive.org/web/20120716225141/http://www.midi.org/aboutmidi/products.php#NonTrad |date=2012-07-16 }}". ''midi.org''. The MIDI Manufacturers Association. n.d. Web. 10 August 2012.</ref> which rearrange the scale tones into an isometric layout,<ref>{{cite web|url=http://www.theshapeofmusic.com/note-pattern.php |title="Note pattern". ''theshapeofmusic.com''. n.p. n.d. Web. 10 Aug 2012 |publisher=Theshapeofmusic.com |access-date=2012-11-27 |url-status=dead |archive-url=https://web.archive.org/web/20120219085411/http://www.theshapeofmusic.com/note-pattern.php |archive-date=2012-02-19 }}</ref> and Haken Audio's keyless, touch-sensitive [[Continuum (instrument)|Continuum]] playing surface.<ref>{{cite web |url=http://www.hakenaudio.com/Continuum/hakenaudioovervg.html |title="Overview". ''hakenaudio.com''. Haken Audio. n.d. Web. 10 Aug 2012 |publisher=Hakenaudio.com |access-date=2012-11-27 |archive-url=https://web.archive.org/web/20120717080025/http://www.hakenaudio.com/Continuum/hakenaudioovervg.html |archive-date=17 July 2012 |url-status=dead }}</ref> Experimental MIDI controllers may be created from unusual objects, such as an ironing board with heat sensors installed,<ref>Gamboa, Glenn. "[https://www.wired.com/entertainment/music/news/2007/09/handmademusic MIDI Ironing Boards, Theremin Crutches Squeal at Handmade Music Event]". ''Wired.com''. Condé Nast. 27 September 2007. 13 August 2012. Web.</ref> or a sofa equipped with pressure sensors.<ref>"[http://www.midi.org/aboutmidi/products.php#NonTrad MIDI Products] {{Webarchive|url=https://web.archive.org/web/20120716225141/http://www.midi.org/aboutmidi/products.php#NonTrad |date=2012-07-16 }}". ''midi.org''. MIDI Manufacturers Association. n.d. 13 August 2012. Web.</ref> [[GRIDI]] is a large scale physical MIDI sequencer with embedded LEDs developed by Yuvi Gerstein in 2015, which uses balls as inputs.<ref>{{Cite web|url=https://www.focus.de/digital/videos/dld-2016-geniale-erfindung-mit-diesem-tisch-koennen-selbst-unmusikalische-komponieren_id_5221336.html|title=Geniale Erfindung: Mit diesem Tisch können selbst Unmusikalische komponieren - Video|first=FOCUS|last=Online|website=FOCUS Online}}</ref><ref>{{Cite web|url=https://www.electronicbeats.net/the-feed/this-massive-midi-sequencer-turns-the-virtual-real/|title=Could This Be The World's Biggest MIDI Controller?|date=July 13, 2016|website=Telekom Electronic Beats}}</ref> The [[Eigenharp]] controller is a combination of a breath controller, a configurable series of multi-dimensional control keys, and ribbon controllers designed to control its own virtual instrument software.<ref>{{cite web |last1=McNamee |first1=David |title=Hey, what's that sound: Eigenharp |url=https://www.theguardian.com/music/2011/jan/19/whats-that-sound-eigenharp |website=The Guardian |date=19 January 2011 |publisher=Guardian News and Media Limited |access-date=10 January 2019}}</ref>

==Auxiliary controllers==
Software synthesizers offer great power and versatility, but some players feel that division of attention between a MIDI keyboard and a computer keyboard and mouse robs some of the immediacy from the playing experience.<ref>Preve, Francis. "Dave Smith", in "The 1st Annual ''Keyboard'' Hall of Fame". ''Keyboard'' (US). NewBay Media, LLC. Sep 2012. Print. p.18</ref> Devices dedicated to real-time MIDI control provide an ergonomic benefit and can provide a greater sense of connection with the instrument than can an interface that is accessed through a mouse and computer keyboard. 

Controllers may be general-purpose devices that are designed to work with a variety of equipment, or they may be designed to work with a specific piece of software. Examples of the latter include Akai's APC40 controller or Nakedboards MC-8 for [[Ableton Live]], and Korg's MS-20ic controller which is a reproduction of their [[MS-20]] analog synthesizer. The MS-20ic controller includes [[patch cables]] that can be used to control signal routing in their virtual reproduction of the MS-20 synthesizer and can also control third-party devices.<ref>{{cite web |url=http://www.vintagesynth.com/korg/legacy.php |title=Korg Legacy Collection |website=Vintage Synth Explorer |access-date=21 August 2012}}</ref>

===Control surfaces===
Control surfaces are hardware devices that provide a variety of controls that transmit real-time controller messages. These enable software instruments to be programmed without the discomfort of excessive mouse movements,<ref name="WalkerControl">Walker, Martin. "[http://www.soundonsound.com/sos/oct01/articles/pcmusician1001.asp Controlling Influence] {{webarchive|url=https://web.archive.org/web/20120110112533/http://www.soundonsound.com/sos/oct01/articles/pcmusician1001.asp |date=2012-01-10 }}". ''Sound On Sound''. SOS Publications. Oct 2001. Print.</ref> or adjustment of hardware devices without the need to step through layered menus. Buttons, sliders, and knobs are the most common controllers provided, but [[rotary encoder]]s, [[transport controls]], joysticks, [[ribbon controller]]s, vector touchpads in the style of Korg's [[Kaoss pad]], and optical controllers such as Roland's [[D-Beam]] may also be present. Control surfaces may be used for mixing, sequencer automation, turntablism, and lighting control.<ref name="WalkerControl" />

===Specialized real-time controllers===
[[Audio control surface]]s often resemble [[mixing console]]s in appearance, and enable a level of hands-on control for changing parameters such as sound levels and effects applied to individual tracks of a [[multitrack recording]] or channels supporting a live performance.

MIDI footswitches are commonly used to send MIDI program change commands to effects devices but may be combined with a pedalboard for more detailed adjustment of effects units. Pedals are available in the form of on/off switches, either momentary or latching or as [[expression pedal]]s whose position determines the value of a MIDI continuous controller.

[[Drawbars|Drawbar]] controllers are for use with MIDI and virtual organs. Along with a set of drawbars for timbre control, they may provide controls for standard organ effects such as [[Leslie speaker]] speed, vibrato and chorus.<ref>{{cite web |url=http://www.voceinc.com/manuals/Dbman_r3.htm#What |title="Drawbar Manual v. 1.2". Voce, Inc. n.d. Web. 10 Aug 2012 |publisher=Voceinc.com |access-date=2012-11-27 |url-status=dead |archive-url=https://web.archive.org/web/20130405033832/http://www.voceinc.com/manuals/Dbman_r3.htm#What |archive-date=2013-04-05 }}</ref>

==Use in a data stream==
{{See also|General MIDI#Controller events}}

Modifiers such as modulation wheels, pitch bend wheels, sustain pedals, pitch sliders, buttons, knobs, faders, switches, ribbon controllers, etc., alter an instrument's state of operation, and thus can be used to modify sounds or other parameters of music performance in real time via MIDI connections. 

Some controllers, such as pitch bend, are special. Whereas the data range of most continuous controllers (such as volume, for example) consists of 128 steps ranging in value from 0 to 127, pitch bend data may be encoded with over 16,000 data steps. This produces the illusion of a continuously sliding pitch, as in a violin's portamento, rather than a series of zippered steps such as a guitarist sliding their finger up the frets of their guitar's neck.

The original MIDI specification included 128 virtual controller numbers for real-time modifications to live instruments or their audio. MIDI Show Control (MSC) and MIDI Machine Control (MMC) are two separate extensions of the original MIDI spec, expanding MIDI protocol to accept far more than its original intentions.

==Common products==
The most common MIDI controllers encountered are various sizes of MIDI keyboards.  A modern controller lacks internal sound generation, instead acting as a primary or secondary input for a [[synthesizer]], [[digital sampler]] or a computer running a [[VST instrument]] or other software sound generator.  Many have several user-definable knobs and slide controls that can control aspects of a synthesizer's sound in real time.  Such controllers are much cheaper than a full synthesizer and are increasingly equipped with [[Universal Serial Bus]], which allows connection to a computer without a MIDI interface.  Despite not using MIDI directly, software applications recognize such controllers as a ''MIDI device''. In most cases, a USB-equipped controller can draw necessary power from USB connection, and does not require an [[AC adapter]] when connected to a computer.  Keyboards range in size from 88 weighted-action keys to portable 25-key models.

==References==
{{Reflist}}

{{Computer music}}
{{Music technology}}

[[Category:Computer peripherals]]
[[Category:Electronic musical instruments]]
[[Category:MIDI]]