I cannot comment on other boards as I have only used technics, but as old a keyboard as it might be, the technics kn series - 7000, or 6500, or 6000 etc. - all have pretty extensive sequencing capabilities ... you can find a kn6000 owners manual to look at here:
http://service.us.panasonic.com/OPERMANPDF/SXKN6000.PDF

technics owners here and on the technics forum occasionally will part with their kb