+ <dt><abbr title="Linux Audio Developers' Simple Plugin API">LADSPA</abbr></dt>
+ <dd>An early, simple, lightweight plugin <abbr title="Application
+ Programming Interface">API</abbr>, audio effects only,
+ plugins have no editors/GUI of their own (Ardour provides one, however).</dd>
+ <dt><abbr title="LADSPA Version 2">LV2</abbr></dt>
+ <dd>An extensible, full-featured plugin API, audio and <abbr
+ title="Musical Instrument Digital Interface">MIDI</abbr>, plugins can provide their
+ own <abbr title="Graphical User Interface">GUI</abbr>s</dd>
+ <dt><abbr title="Audio Unit">AU</abbr></dt>
+ <dd>OS X only, full featured, audio and MIDI, plugins can provide their own GUI</dd>
+
+ <dt>Linux <abbr title="Virtual Studio Technology">VST</abbr></dt>
+ <dd>Plugins using Steinberg's VST plugin standard but compiled specifically for Linux</dd>