These are the 2 ways to regen the source files in Reaper:
Like many other people in this forum, I have absolutely zero idea what you are talking about.
GIF is confusing.
Would be way better, if you could take a few screenshots, then put some texts inside the picture. Just like what I did in this thread.
By looking at the screenshots and reading the texts in them, I can follow each steps to achieve the goal of regenerating RealDrums in Reaper with the two methods.