Slower songs get me...once I make the decision where to put the beat, ( mega tree , mini trees , arches) faster songs usually work right along. I have done several from scratch but most of my stuff started as 16 channel sequences I bought or found for free. So from year to year when I add an element I just add a track and follow the frame work. Some talented people did some good work and it helped me get started and learn how to do it.