Squeak,
I am a dealer here in the USA. I haven't purchased any WK1 because it is their entry level keyboard. I know that it does not have a 16 track recorder. It can play back 16 tracks but it can only record Accomp, Upper 1, Upper 2 and possibly a lower track for the record modes. It is a lower priced version of the WK2 and although the WK2 is a god keyboard, I would not consider it a pro type arranger unless you own the oriental version which is quite good for middle eastern music.
I will research more info for you and get back.
George Kaye
Kaye's Music Scene
Reseda, California