I fully concur with what Don says here.
Incidentally, a friend of mine remarked that I have created the impression of wanting to promote the Korg Micro Arranger. Well that is only half true. I wish Yamaha, and more in particular Ketron and Roland would release mini arrangers like that and at those budget prices. I would get them without another thought !
And let's not forget that the KMA is a full fledged replica of the PA50 and more or less the PA80. All I am saying here is that it pays to consider adding such a lot of sounds and styles for such a comparitively small amount of money. By doing what I suggest as regards MIDI connecting the acc. section you also circumnavigate the use of the smaller keys. ( not that all that many find fault with those).
So rather than appealing to the companies to synchronise everything as Diki would want ( and which is unlikely to happen) I would say, get out some mini arranger keyboards or sound modules. ( Yamaha ,Ketron, Roland)

regards,
John