VST2

VST2 is the second version of the Virtual Studio Technology audio plug-in standard, developed by Steinberg to enable third-party software to extend digital audio workstations. It defines a plugin interface that allows hosts to load software synthesizers (instruments) and effects that process audio within a project.

VST2 plug-ins are categorized as instruments (VSTi) and effects. They communicate with hosts via a published API that supports parameter automation, audio input/output, and MIDI control. Plugins are distributed as platform-specific binaries: on Windows they appear as dynamic-link libraries (.dll); on macOS they are packaged as VST bundles (often with a .vst extension).

Historically, VST2 was introduced by Steinberg in the late 1990s and became the de facto standard for computer-based music production through the 2000s. It was followed by VST3, which introduced enhancements such as a redesigned processing model and better host communication. In recent years Steinberg and the broader ecosystem have reduced emphasis on VST2; licensing for new VST2 development has been limited, and several hosts have shifted toward VST3 or other formats while preserving compatibility with legacy VST2 plugins.

VST2 is cross-platform and widely supported by many DAWs on Windows and macOS. 32-bit and 64-bit compatibility varies by host and plugin; modern hosts typically require 64-bit plugins, and users may employ bridging tools to run 32-bit VST2 plugins in 64-bit hosts.

See also: VST3, Audio Units, AAX. External resources include the VST SDK and developer documentation.