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Nah, the midi is for triggering hardware changes and syncing with a beat synced guitar pedal so the change events need to be transmitted.



Ok i played around with KaraFun and you can have a midi file and a wav file played at the same time.
So you should be able to save the triggering midi and render the songs to wav or mp3
and then add them to the library in the editor.
There is a button on the player that lets you choose both audio sources or just one
You will need the Studio version of KaraFun.

So you have a few options now.

https://stash.reaper.fm/u/ReaTrak (Scripts for Biab Reaper)
Open SGU in Reaper Instantly