just to clarify (hopefully i won't muddy the waters with this), Reaper has two MIDI input paths - the standard MIDI path, for which you need to "enable input" - and the control path, for which you need to "enable for control messages".
It's a slightly confusing name, because his second one is NOT exclusively for CCs, as we know them, but for controlling Reaper functions outside of the standard MIDI items. So for things like play, record, mixer fader levels etc., (but also for parameter modulation / MIDI learn)
If you want to use CCs to manipulate parameters of a MIDI instrument on a MIDI track or item you just need to "enable input" and make sure your instrument's parameters are assigned to the relevant CC.
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