If Yamaha are reticent to even jump into the 76 note mid-line and up arranger market, you can pretty much guarantee they'll NEVER attempt this...!

But he has a point (one I've been making for a while now, as well)... If you could only make an MS come OOTB sounding better and with better styles than the Tyros's and PA2X's (and Roland's, even!), they would be lining up round the block to buy them...

Just do what Yamaha do... for the 'preset junkies' just sell online content (loops, sounds AND style, all neatly packaged) at regular intervals, and have a steady source of additional income. Keep it 'open' for the tweakers, but keep a steady supply of pre-digested content for those that would LOVE the keyboard, but NOT the work to make it sound good...

The hardware is great, but the CONTENT still has a long way to go. Freeze the design for a little while (as long as it is bug-free) and concentrate ALL your R&D on the content, and you'll be amazed at the difference in sales, I am sure...
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An arranger is just a tool. What matters is what you build with it..!