I found this site. its free and you can build a loop and export the wave file to add to the BB
http://www.drumbot.com/projects/drumbot/
there is also a free sequencer if you’d like map out a beat. I’ve used it with a few other drum machine but have yet to put one on the beat buddy. I’ll have it figured out soon though. Maybe share your song beat loop and the drumbot setting so we can all use them or edit to our liking.