Saike has made the REAPER community an amazing free electronic drum plugin in JSFX format, and I highly recommend trying it!
In this video I do a quick demo of how to use it, and then use it to build a short song.
You can download and play with this plugin right now by adding Saike’s repository to ReaPack
Saike plugin thread on REAPER Forum
https://forum.cockos.com/showthread.php?t=220277