being styles are a main feature using an arranger kb......and they all have the ability and tools to edit and create custom styles from scratch....and you need the talent as a player to be able to play well enough to create them properly.....manufacturers should start developing tutorial DVDS for beginner, intermediate, & advanced players so they can learn how to create styles for them selves......this would eliminate so many of the repetitious ones we already have which work well BUT sometimes you want to make the song parts your own with horn stabs, bass lines, specific string passages etc, etc, ...this is what making music is all about....
doing it YOUR WAY not having some company do it for you. don't doubt your abilities I know you can do it also...