Like spike said there were some saving issues with older versions of EZ Drummer, so be sure that you have updated to the latest version over there. Also you can grab some great track templates here that already have the drums assigned to different tracks. There is one for the Drum Kit From Hell. This also has a bunch of drum note maps. Just note that you no longer need the plug in mentioned as it is now built in functionality to Reaper. I took these excellent track templates from Billybk and tweaked them (thinks like combining snare top/bottom to the same track, and splitting the toms to separate tracks etc). I have templates for the Pop/Rock, Vintage and Drum Kit From Hell, and all open with the right Kit, and the mixer/track routing.