We are ALL pretty small spokes (except for a certain amphibian, that thinks it's the whole wheel )... but if you don't mind sending your suggestions to Yamaha, what harm is there in discussing it here, either?

The thing is, whatever Yamaha DO put into the next PSR, you will probably find it worth upgrading to. Surely you too aren't in the 'Yamaha's model increases are too incremental' camp too?
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An arranger is just a tool. What matters is what you build with it..!