Happily Reaper is constructed in a straight forward way, completely ignorant about what kind of plugin the user decides to put where in the effect chain. Deviations from this would not be compatible with decently clear (Pin and Midi) routing mechanisms.
(Unfortunately) this seems to be impossible with ARA plugins which for working decently seemingly need to be placed at the beginning of the chain, and Reaper forcibly puts them there.
-Michael
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