If you are doing everything "in the box" - i.e. not wanting to connect external stand alone synths or other programs to Reaper, you do't need jack at all. And Carla, when you are using it as a vst does not require jack. Don't run jack. Select Alsa in Reaper, and load Carla as a vst. Jack midi is also a pain in the ass compared to Alsa midi (at least with Jack2). Alsa midi just works in Reaper now.
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