... I'd have to agree with most of what's been mentioned above.

I believe, the 'perfect' keyboard (YAKETECHORG-X)would be one where ...
* Outer board and OS designed by YAMAHA.
* Sound generator designed by KORG and KETRON (the former for synth sounds, the latter for solo/sweet voices).
* Accompaniment, Arranger designed and programmed by KETRON.
* Sampler designed by KORG.
* Sequencer designed by TECHNICS.
* Vocal harmonizer designed by DIGITECH.

* The entire keyboard should be assembled in JAPAN (similar to how Airbus is designed & built in many European nations and finally assembled in France).

Just my thoughts ...

AJ