So why isn't an NP-30 what you use for piano, Ian (or at least a non-weighted 88)... I mean, if a volume control is all you need, why lug around a full 88 weighted action when a toy 88 would do the job JUST as well?

Your own purchasing decisions contradict your position here... but then again, I suppose you could say that consistency is the hobgoblin of small minds (like me an' Fran )...

Try putting that premise to any top PRO player lugging an RD700 around, or MotifXS8 or Nord Stage 88 (or the weighted 76). Tell them they are wasting their time using a fully weighted (or even half-weighted) action, when a non-weighted PSR keyboard does the job JUST as well. In fact, tell the customers at the piano stores you go to that 'fact'.

Watch them laugh their asses off...
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An arranger is just a tool. What matters is what you build with it..!