John Smies,
Yamaha is the same way too. Look at the major differences between the PSR-640/740 and the PSR-1000/2000.... The 64O was majorly stripped down from the 740. 1/2 the poly, no vocalizer, no modulation, no drawbars, less Mb's, and several other features. Even the PSR-1000/2000 have some big differences to. Again 1/2 the poly, less memory, no modulation wheel.. On the topic of modulation wheels, why in the hell does Yamaha do that? How hard would it be to add modulation wheels to the boards? Why in the world would they have it on the 740, 2000 and not on the 640, 1000? What a dumb thing to leave off. Heck you can get modulation wheels on the Casio's. Look at the Casio WK1800/1600/1630.. They differ by a disk drive and 2800 notes in the sequencer. Casio at least lets you have the modulation wheel on both models.

Squeak