Target "Global: Last touched"
This will control whatever target has been last touched in REAPER. It’s similar to the built-in REAPER action "Adjust last touched FX parameter" but provides the following benefits:
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It’s applicable to all ReaLearn targets that are learnable, not just FX parameters. 
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It offers feedback. 
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It can distinguish between parameter modifications caused by ReaLearn (i.e. hardware control) and those caused in other ways (e.g. via mouse).