I would like to use an external "real" compressor on the master bus in Reaper.
Is there any guide on how to do this? I tried but just seem to end up with a feedback loop.
you could use ReaInsert, there are probably some comprehensive tutorials floating around, but basically just load it as an insert & select your ins & outs (the connections to the compressor) from the dropdown boxes
isn't on the 2buss here but using ReaInsert on several different comps on drums for Parallel.. but same way you'd route the compressor to Reainsert for the 2buss