No such thing as a 'pro' arranger, Ian. The S910 certainly isn't one (by your own admission). All we want is a 76 version of the 'home' arrangers that are already popular.

Yamaha's market research has shown that there IS a market for many different types of 76 note arrangers (whether Yamaha want to call them that or not). And Yamaha's market research has shown that there is a market for a mid priced arranger with sophisticated sounds and OS (even though it is aimed squarely at the home market). But mysteriously, Yamaha think that these two markets are TOTALLY independent of each other. No-one that wants a sophisticated mid level arranger would EVER want a 76, and no-one that wants a 76 arranger would ever want a sophisticated one.

And if THAT doesn't strike you as absurd, I don't know what will...