Which Reaper version? And which FX/plugin?
I guess it's probably just not working for the FX you're using, because the Action FX: Show/hide track envelope for last touched FX parameter isn't working here either for certain FX/plugins when Reaper doesn't get any 'last touched' parameter information sent from the FX/plugin (for whatever reason). So there is no last touched parameter in this case in order to trigger a corresponding Action for it ...
As a side note: you can click, for instance, on the [Param] button in the FX window to see what the last touched parameter currently is. And if there isn't one, it usually displays 'No recently touched FX Parameter'.
Last edited by solger; 11-17-2017 at 01:01 PM.
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