How Do I.....

get my M-Audio KeyRig 49 Midi controller work with Reaper. its not showing up as an option in "MIDI Devices" in preferences.

did you install the drivers?

I've just setup an m-audio axiom49 in reaper. Works really well! Make sure you dload the latest drivers and install them as suggested. Then click the 'safely remove hardware' icon inthe tooltray and it should show your kbd. Now run reaper and config it in preferences.

i've an Oxygen 61, just plugged it in without installing the additional drivers, and reaper found it no problem, though it's not listed under its name, but something like generic midi device, or some such, i can't check at the moment, i'll try to remember when i get a chance though.