Most manufacturers rely on "road testing" before the final bugs are ironed out. Microsoft is FAMOUS for letting "end users" tell them what to do to make windows work better. It is a fact of big business that makes financial sense. It's cheaper to built it - sell it, and THEN fix it than is is to test, and re test BEFORE they even know what the market wants.
This is NOT a defense of the practice - just an honest observation of business ethics(...or the lack thereof !)
I'm confident that within a reasonable time, Yamaha will correct these anomolies and we'll all be happy for a few more days. Progress takes time, and this PSR2k is WORLDS ahead of anything I've owned in the last 10 years. My mic never sounded better than it does through this keyboard. The harmonies are not my ABSOLUTE favorite, but they are WAAAY above average.
Let's keep voicing our needs, and staying as patient as we can .... It'll get better.