Tony - Believe it or not but none of the parts are written down. Ric is simply that good! We are fortunate to have him on our team. You are correct that each part was recorded as an independent track in Logic Pro. In this case, we are showing what the unit sounds like vs. showing the styles as in some of the previous videos. We have a couple more arrangements done on both SD40 and SD90 that were put together the same way. Watch for those to be coming out over the next few days.