Hello, new to the forum and new Yamaha E423 arranger user.

I have figured out how to record some of my playing. But I can't seem to get the machine to play back the background drum pattern I'm using. For instance, I can manage a simple boogie woogie thing with piano and drums, but when I playback the reocrding the drum patter doesn't sound. Can anyone direct me to how to get the drums to playback in my recording?