Ian, years ago I would make many custom SMF songs for backing tracks using my Korg M1, & i Series arrangers....then as years progressed I also used style assembly with my Yamahas also when I had to have just the right style to conform with what ever song I would perform......I also dabbled with recording certain parts too which really brings you into the customizational world of style making. I f your going to record your work then you have more flexibility in the multi-tracking process...but a style is another ball game if your going to use it in a live situation for sure. Many players veer away from the style making process because if its difficulties....but hopefully in time manufacturers will create easier on-board formats to do this more easily for beginner & advanced on all arrangers coupled with Quality instructional DVDS on the topic and beyond....Thanx for your views.