Working with VST Plugins : About VST plugins

About VST plugins
VST (Virtual Studio Technology) is a software instruments and effects plug-in format designed by Steinberg. Reason 12.5 and later supports 64-bit VST3 and VST2 (2.4) plugins. VST plugins integrate nicely with the Reason rack:
VST compatibility in Reason
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Working with VST Plugins : About VST plugins