I've been using KORG arrangers ever since the FIRST one the SAS20 personal arranger around 1983, and before that most of my Synths were KORG also....and almost everyone since then up to the Pa3x....yes, I drifted with other Brands thru the years but always returned to KORG.
FYI here is the Korg SAS 20 Arranger KB I mentioned above...
KORG SAS 20 Personal Arranger