Too bad Yamaha doesn't incorporate what KORG has in its arrangers where you can delete all factory sounds & styles if you wish and only load & use what you need.....this is one of the things I liked about Korg & Roland arranger KBs.....Although Yamaha has some awesome sounds & styles....IMO others have much more USER editing capabilities then Yamaha....it frees up Ram & lets you make the KB YOUR OWN.