Look, Steve Jobs and Steve Wozniac didn't have scores of people coming to them and going 'you know, we would really like a small 'home' computer'. Nobody even imagined it could be possible, let alone think of the possible use for such a thing. They simply built it first, at considerable cost and risk to themselves, and the rest is a slice of Apple pie history.
The market did not EXIST until the product was built. The egg came first... This is what keyboard manufacturers need to acknowledge. Unless they build it, there will NEVER be a market for the product.
And, I'm sorry, but the MS does not count. It has the HARDWARE to do what needs to be done, but is still basically without CONTENT. Why is that important? Because, if you tried to sell a MotifXS with NO loops and arps already provided (but only the capability to make your own) they would sell in a tiny fraction of the numbers they do now. Our WS brothers are JUST as hooked on provided content as we are...
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An arranger is just a tool. What matters is what you build with it..!