Hi Gustavo,
The MZ-2000 is a great buy,and I congratulate you on your purchase,and I'm sure you'll be more than satisfied with the instrument.
I believe the verdict is still out on the Casio/Technics relationship,although Fran seem to be certain there isn't one.My record of being right is not as good as his,so I have to try harder,although I have come to believe the MZ-2000 was distinctly different from all other Casios (especially in the synth programming and accompaniment sections). I have thoroughly checked this out ,and ,although I wouldn't bet my house on the Technics connection,the MZ is a very different product for Casio.
To me, the accompaniment section,which on the MZ-2000 is unique to this instrument ,is far ahead of other (even newer!)Casios(and the PSR-3000 as well,according to Fran!) is the most important clue to the MZ maybe having a connection with Technics.
Perhaps someone else more knowledgeable about the MZ-2000 and Casios in general can shed more light on this. Here is a web address where one reviewer(the first one) finds the MZ-2000 similar in many ways to the Technics KN series.
http://www.harmony-central.com/Synth/Data/Casio/MZ_2000-1.htm'tl
I agree with what Fran has said,...".Enjoy the keyboard for what it is...the Flagship Casio...Casio's best.....Don't be concerned with this so called link to Technics...."
Here is a site that may help you,it is a Yahoo Group for Casio users and is free to join.
http://launch.groups.yahoo.com/group/casio_keyboards/ Best of luk!
Ian