OSC can be used to get Unreal Engine and Bitwig to communicate back and forth with each other :) The OSC plugin can also be used with Reaper.
Bitwig plugin site: http://www.mossgrabers.de
Plugin command documentation: https://github.com/git-moss/DrivenByM...
Loopmidi site: https://www.tobias-erichsen.de/softwa...
Unreal OSC Documentation: https://docs.unrealengine.com/en-US/E...