Korg arranger keyboards have an advanced style creator onboard. It is easy to create styles without using any external tools. There are options to export and import style parts as midi files as well.
This video shows the steps for creating a new style from scratch. This is the first part. There will be another part which is a continuation of this video.
It covers recording on different tracks, use of resolution, copying elements/tracks to another, how to use the copy option in the page menu and guitar mode basics.