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<title>Virtual Studio Technology</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Virtual Studio Technology</span></span>

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</style><div role="note" class="hatnote navigation-not-searchable">This article is about the audio

interface standard. For the visual technology, see <a href="On-set_virtual_production" title="On-set virtual production">On-set virtual production</a>. For the former film company, see <a href="Virtual_Studios" title="Virtual Studios">Virtual Studios</a>.</div>

<p><b>Virtual Studio Technology</b> (<b>VST</b>) is an <a href="Audio_plug-in" title="Audio plug-in">audio plug-in</a> software interface that integrates <a href="Software_synthesizer" title="Software synthesizer">software synthesizers</a> and <a href="Effects_unit" title="Effects unit">effects units</a> into <a href="Digital_audio_workstation" title="Digital audio workstation">digital audio workstations</a>. VST and similar technologies use <a href="Digital_signal_processing" title="Digital signal processing">digital signal processing</a> to simulate traditional <a href="Recording_studio" title="Recording studio">recording studio</a> hardware in software. Thousands of plugins exist, both commercial and <a href="Freeware" title="Freeware">freeware</a>, and many audio applications support VST under license from its creator, <a href="Steinberg" title="Steinberg">Steinberg</a>.

</p>

<div class="mw-heading mw-heading2"><h2 id="Overview">Overview</h2></div>

<p>VST <a href="Plug-in_(computing)" title="Plug-in (computing)">plugins</a> generally run within a <a href="Digital_audio_workstation" title="Digital audio workstation">digital audio workstation</a> (DAW), to provide additional functionality, though a few standalone plugin hosts exist that support VST. Most VST plugins are either instruments (VSTi) or effects (VSTfx), although other categories exist—for example <a href="Spectrum_analyzer" title="Spectrum analyzer">spectrum analyzers</a> and various meters. VST plugins usually provide a custom <a href="Graphical_user_interface" title="Graphical user interface">graphical user interface</a> that displays <a href="Skeuomorph" title="Skeuomorph">controls similar to physical switches and knobs on audio hardware</a>. Some (often older) plugins rely on the host application for their user interface.

</p><p>VST instruments include software simulation <a href="Emulator" title="Emulator">emulations</a> of well-known hardware <a href="Synthesizer" title="Synthesizer">synthesizers</a> and <a href="Sampler_(musical_instrument)" title="Sampler (musical instrument)">samplers</a>. These typically emulate the look of the original equipment as well as its sonic characteristics. This lets musicians and recording engineers use virtual versions of devices that otherwise might be difficult and expensive to obtain.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>

</p><p>VST instruments receive notes as digital information via <a href="MIDI" title="MIDI">MIDI</a>, and output digital audio. Effect plugins receive digital audio and process it through to their outputs. (Some effect plugins also accept MIDI input—for example, MIDI sync to modulate the effect in sync with the tempo). MIDI messages can control both instrument and effect plugin parameters. Most host applications can route the audio output from one VST to the audio input of another VST (<i>chaining</i>). For example, the output of a VST synthesizer can be sent through a VST <a href="Reverberation" title="Reverberation">reverb</a> effect.

</p>

<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>

<p>Steinberg released the VST interface specification and SDK in 1996. They released it at the same time as <a href="Steinberg_Cubase" class="mw-redirect" title="Steinberg Cubase">Steinberg Cubase</a> 3.02, which included the first VST format plugins: Espacial (a <a href="Reverberation" title="Reverberation">reverb</a>), Choirus (a <a href="Chorus_effect" class="mw-redirect" title="Chorus effect">chorus effect</a>), Stereo Echo, and Auto-Panner.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>

</p><p>Steinberg updated the VST interface specification to version 2.0 in 1999. One addition was the ability for plugins to receive MIDI data. This supported the introduction of <i>Virtual Studio Technology Instrument (VSTi)</i> format plugins. VST Instruments can act as standalone software synthesizers, samplers, or drum machines.<sup id="cite_ref-Sound_3.7_4-0" class="reference"><a href="#cite_note-Sound_3.7-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>

</p><p>Neon<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> was the first available VST Instrument (included with Cubase VST 3.7). It was a 16-voice, 2-oscillator <a href="Virtual_analog_synthesizer" class="mw-redirect" title="Virtual analog synthesizer">virtual analog synthesizer</a>.<sup id="cite_ref-Sound_3.7_4-1" class="reference"><a href="#cite_note-Sound_3.7-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>

</p><p>In 2006, the VST interface specification was updated to version 2.4. Changes included the ability to process audio with 64-bit precision.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> A free-software replacement was developed for <a href="LMMS" title="LMMS">LMMS</a> that would be used later by other free-software projects.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>

</p><p>VST 3.0 came out in 2008. Changes included:<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup>

</p>

<ul><li>Audio Inputs for VST Instruments</li>

<li>Multiple MIDI inputs/outputs</li>

<li>Optional SKI (Steinberg Kernel Interface) integration</li></ul>

<p>VST 3.5 came out in February 2011. Changes included <i>note expression</i>, which provides extensive articulation information in individual note events in a polyphonic arrangement. According to Steinberg, this supports performance flexibility and a more natural playing feel.

</p><p>In October 2011, <a href="Celemony_Software" title="Celemony Software">Celemony Software</a> and <a href="PreSonus" title="PreSonus">PreSonus</a> released <a href="Audio_Random_Access" title="Audio Random Access">Audio Random Access</a> (ARA), an extension for <a href="Audio_plug-in" title="Audio plug-in">audio plug-in</a> interfaces, such as VST, allowing greater integration between <a href="Audio_plug-in" title="Audio plug-in">audio plug-ins</a> and <a href="Digital_audio_workstation" title="Digital audio workstation">DAW</a> software.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup>

</p><p>In September, 2013, Steinberg discontinued maintenance of the VST 2 SDK. In December, Steinberg stopped distributing the SDK.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> The higher versions are continued. VST come in three types. VSTi, VST Effects, VST MIDI Effects. Plugins are one of the best way to create endless music. It is like a evolution in the music industry.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup>

</p><p>VST 3.6.7 came out in March, 2017. It includes a preview version of VST3 for Linux platform, the VST3 part of the SDK gets a dual license: "Proprietary Steinberg VST3" or the "Open-source GPLv3".<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="VST_plugins">VST plugins</h2></div>

<p>There are three types of VST plugins:

</p>

<ul><li><b>VST instruments</b> generate audio. They are generally either <a href="Software_synthesizer" title="Software synthesizer">virtual synthesizers</a> or <a href="Software_sampler" class="mw-redirect" title="Software sampler">virtual samplers</a>. Many recreate the look and sound of famous hardware synthesizers. Better known VST instruments include <a href="Discovery_(synth)" title="Discovery (synth)">Discovery</a>, Nexus, Sylenth1, Massive, Omnisphere, FM8, Absynth, Reaktor, Gladiator, Serum and Vanguard.</li>

<li><b>VST effects</b> process rather than generate audio—and perform the same functions as hardware audio processors such as <a href="Reverberation" title="Reverberation">reverbs</a> and <a href="Phaser_(effect)" title="Phaser (effect)">phasers</a>. Other monitoring effects provide visual feedback of the input signal without processing the audio. Most hosts allow multiple effects to be chained. Audio monitoring devices such as spectrum analyzers and meters represent audio characteristics (frequency distribution, amplitude, etc.) visually.</li>

<li><b>VST MIDI effects</b> process MIDI messages (for example, <a href="Transposition_(music)" title="Transposition (music)">transpose</a> or arpeggiate) and route the MIDI data to other VST instruments or to hardware devices.</li></ul>

<div class="mw-heading mw-heading2"><h2 id="VST_hosts">VST hosts</h2></div>

<p>A VST host is a software application or hardware device that VST plugins run under. The host application presents the plugin UIs and routes <a href="Digital_audio" title="Digital audio">digital audio</a> and <a href="MIDI" title="MIDI">MIDI</a> to and from the plugins.

</p><p>Examples of VST hosts include media players such as <a href="JRiver_Media_Center" title="JRiver Media Center">JRiver Media Center</a> and <a href="Foobar2000" title="Foobar2000">foobar2000</a>.

</p><p>Stand-alone <i>dedicated hosts</i> provide a host environment for VST plugins rather than use the plugins to extend their own capabilities. These are usually optimized for live performance use, with features like fast song configuration switching.

</p><p>VST plugins can be hosted in incompatible environments using a translation layer, or <a href="Shim_(computing)" title="Shim (computing)">shim</a>. For example, <a href="FL_Studio" title="FL Studio">FL Studio</a> only supports its own internal plugin architecture, but an available native "wrapper" loads VST plugins, among others. <a href="FXpansion" title="FXpansion">FXpansion</a> offers a VST-to-RTAS (<a href="Real_Time_AudioSuite" class="mw-redirect" title="Real Time AudioSuite">Real Time AudioSuite</a>) wrapper that lets VST plugins run in <a href="Pro_Tools" title="Pro Tools">Pro Tools</a>, and a VST-to-<a href="Audio_Units" title="Audio Units">Audio Units</a> wrapper lets VST plugins run in <a href="Logic_Pro" title="Logic Pro">Logic Pro</a>.

</p>

<div class="mw-heading mw-heading3"><h3 id="Hardware">Hardware</h3></div>

<p>Hardware VST hosts can load special versions of VST plugins. These units are portable and usable without a computer, though some of them require a computer for editing. Other hardware options include PCI/PCIe cards designed for audio processing, which take over audio processing from the computer's <a href="CPU" class="mw-redirect" title="CPU">CPU</a> and free up <a href="Random-access_memory" title="Random-access memory">RAM</a>.

</p><p>Some hardware hosts accept VSTs and VSTis, and either run Windows-compatible music applications like Cubase, Live, Pro Tools, Logic etc., or run their own DAW. Other are VST Hosts only and require a separate DAW application. <i>Origin</i> from Arturia is a hardware DSP system that houses several VST software synthesizers in one machine, like Jupiter 50/80 from Roland. Using appropriate software, audio data can also be sent over a network, so the main host runs on one computer, and VST plugins on peripheral machines.

</p>

<div class="mw-heading mw-heading2"><h2 id="Standard">Standard</h2></div>

<p>The VST plugin standard is the audio plugin standard created by Steinberg to allow any third-party developers to create VST plugins for use within VST host applications. VST requires separate installations for Windows, macOS, and Linux. The short history of commercial environments for Linux means few developers have targeted this platform.

</p>

<div class="mw-heading mw-heading2"><h2 id="Presets">Presets</h2></div>

<p>VST plugins often have many controls, and therefore need a method of managing presets (sets of control settings).

</p><p>Steinberg Cubase VST introduced two file formats for storing presets: an FXP file stores a single preset, while an FXB file stores a whole bank of presets. These formats have since been adopted by many other VST hosts, although Cubase itself switched to a new system of preset management with Cubase 4.0.

</p><p>Many VST plugins have their own method of loading and saving presets, which do not necessarily use the standard FXP/FXB formats.

</p>

<div class="mw-heading mw-heading2"><h2 id="Competing_technologies">Competing technologies</h2></div>

<ul><li><a href="Apple_Inc." title="Apple Inc.">Apple</a>'s <a href="Audio_Units" title="Audio Units">Audio Units</a></li>

<li><a href="Digidesign" class="mw-redirect" title="Digidesign">Digidesign</a>'s <a href="Real_Time_AudioSuite" class="mw-redirect" title="Real Time AudioSuite">Real Time AudioSuite</a></li>

<li><a href="LADSPA" title="LADSPA">LADSPA</a>, <a href="Disposable_Soft_Synth_Interface" title="Disposable Soft Synth Interface">DSSI</a> for <a href="Linux" title="Linux">Linux</a></li>

<li><a href="LV2" title="LV2">LV2</a>, a cross-platform, open source, liberally licensed audio plugin standard</li>

<li><a href="Microsoft" title="Microsoft">Microsoft</a>'s <a href="DirectX" title="DirectX">DirectX</a> plugin</li>

<li><a href="Mark_of_the_Unicorn" title="Mark of the Unicorn">Mark of the Unicorn</a>'s <a href="Motu_Audio_System" class="mw-redirect" title="Motu Audio System">Motu Audio System</a></li>

<li><a href="JACK_Audio_Connection_Kit" title="JACK Audio Connection Kit">JACK Audio Connection Kit</a>, an open-source sound server allowing flexible audio routing between apps</li>

<li><a href="CLever_Audio_Plug-in" title="CLever Audio Plug-in">CLever Audio Plug-in</a> (CLAP), a MIT-licensed alternative to VST3</li></ul>

<div class="mw-heading mw-heading2"><h2 id="Programming_languages">Programming languages</h2></div>

<p>Steinberg's VST SDK is a set of <a href="C%2B%2B" title="C++">C++</a> classes based around an underlying C API. The SDK can be downloaded from their website.

</p><p>In addition, Steinberg has developed the VST GUI, which is another set of C++ classes, which can be used to build a graphical interface. There are classes for buttons, sliders and displays, etc. Note that these are low-level C++ classes and the look and feel still have to be created by the plugin manufacturer. VST GUI is part of the VST SDK and is also available as a SourceForge project.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup>

</p><p>There are also several ports to other programming languages available from third parties.

</p><p>Many commercial and open-source VSTs are written using the <a href="Juce" class="mw-redirect" title="Juce">Juce</a> C++ framework instead of direct calls to the VST SDK because this allows multi-format (VST, Audio Units and Real Time AudioSuite) binaries to be built from a single codebase.

</p>

<ul><li><a href="LADSPA" title="LADSPA">LADSPA</a> and <a href="LV2" title="LV2">LV2</a>, similar open-source standards</li>

<li><a href="Audio_Stream_Input/Output" title="Audio Stream Input/Output">Audio Stream Input/Output</a> (ASIO)</li>

<li><a href="Software_effect_processor" title="Software effect processor">Software effect processor</a></li>

<li><a href="SynthEdit" title="SynthEdit">SynthEdit</a>, a VST/VSTi editor</li>

<li><a href="Virtual_piano" title="Virtual piano">Virtual piano</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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