Reaper is a music software, or DAW made by Cockos. You can find more about it here.

The Reaper module is based on the OSC module, with premade commands that reflect Reaper's OSC API.

The Reaper Module has very limited premade command support, but you can create your own commands by using the "Custom Message" command. If you wish to have more native support, please contact me and consider donating so I can take more time improving Chataigne !