Just for the interested this opens up, editing capabilities of reaper, be it of midi items or audio items, to any external processors. Those could be implemented in java or c, no matter what. Now somewhere we should create a list of useful command line midi/audio processors, as if the options inside Reaper were not enough.
But yes, in some areas, Reaper is toooo far behind what is already available from science world. I am sure you want an example, here we go:
https://mir.sechsachtel.de/midi/
Quote:
MIDI Optimizer is a program for converting performance-based MIDI files into semantically enriched score-like MIDI files. It determines the musical beat grid from a given performance MIDI file and uses this information to map all MIDI events to a musically meaningful time axis without changing their absolute time positions in seconds. Hence the output of this program can be used as an input for existing MIDI quantization software like music notation programs.
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And Reaper has notation.