Geoff Waddington has been working hard to bring EuCon controller compatibility to REAPER. If you have a Euphonix or Avid Artist series controller and have some time to spare for testing, please help out. Testing has just begun, currently in alpha.
Go to this thread for the latest info and link to drivers. http://forum.cockos.com/showthread.php?t=122509
Bringing “professional” control surface support to REAPER will be a great achievement and certainly no easy task. Help out if you can.