Seems like I'm always advocating TapeIt2 around here. Really. Try it. It saves so much time. Use the multi-out function of EZdrummer. Then insert TapeIt2 on each drum channel. Set it to respond to the transport's "play" button. Hit "play", let the full song play. Hit "stop" when it's over. You're done. All the drum tracks are rendered into wav or mp3 or whatever format you want, all in one shot.