hey guys, i need some help...

I've written a whole drum part out in superior 2 MIDI in reaper, but i need to score it. So I though I'll just import it into sibelius, but that came out as a total mess. So I changed the mapping on SD2 to GM extended, and tried again. same result.

I'm really at a loss for what to do here, I'm quite new to all this midi stuff, so i'm getting really confused and frustrated, any help at all would be much appreciated.