Yamaha sure do have their reasons... profit.

As long as they can force buyers to buy the massively overpriced Clavinovas, simply to get features that they would get on low end PSR's, Yamaha have achieved EXACTLY what they set out to do.

And while at least half of the serious arranger playing demographic feels that even 76 notes is too big (read 'heavy', despite my BK-9 being pounds less than an S950), odds are we will never see capable 88 note arrangers without an obscene 'furniture tax' penalty doubling their price.

The sad thing is, there are VERY good, quite lightweight proper piano feeling 88 note digital pianos out there... The P105 is 25 lbs... about the same as an S950.

But add a few arranger features to one of these, and suddenly you have the 50 lbs. DGX-650. Talk about a fatted calf! Nobody is going to persuade me that Yamaha stuck another 25 lbs. of circuitry inside!

If Yamaha actually WANTED to make a popular 88 note arranger, they would put the S750 circuitry in a P-105 case, add a color touch screen (so the panel isn't overloaded with buttons) and sell it for about $1800.

But then, they'd never sell another $10,000 CVP-609, would they? LOL
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An arranger is just a tool. What matters is what you build with it..!