Go here, there are 2 versions:
1 - with only multiple velocity layers which sounds great
2- With multiple velocity layers and round robins which uses more resources but sounds amazing
It's a vintage Ludwig kit, they created the GUI for Kontakt and Sforzando and a template for Reaper.
https://smmdrums.wordpress.com/for-reaper/
Download, open it in Reaper and press play. You'll be amazed at how great it sounds.
Don't forget the manual it explains how to use it in your mixes.