Hi Lukitoh,
I have a "Y2K" and if I could do a "key transplant" , I would !!
The 1000 and 2000 have the same action, BAD !!!
It is not a bad KB but the way that the keys feel is a shame, it sounds so good.
If you like the "action" of the "Korg" try to get the "PA 80" it`s a few years old but still a "big time favorite" among "arranger players"
Best of luck, O -BTW you can`t up-grade the Yami`s but the "Korgs you can !
jedi