Most of what Relay does is directly on the Mixer in many DAWs. The plug-in exists to enable iZotope to change those settings on tracks without having to implement a dozen (or more) DAW-specific solutions.  Without it, they cannot easily change the panning on a specific track in say, Reaper, Cakewalk, Cubase, Pro Tools, Ableton Live, etc. without some serious development work (if possible at all in some cases, due to poor/lack of automation in a specific DAW).  In order to enable this, they have