For all the invective from the open fans, I AM a big user of open systems But simply put, I use computer based open systems for when I use them in the studio, and closed for when I perform live and need to do stuff quickly. Until the open keyboard does the quick stuff as well as it does the slow, I don't NEED two different keyboards. One for live, and software on a computer for studio works well, is inexpensive, and covers all the bases.

When things change, I'll revisit the question. But it's obvious from the lack of anything live from the open boys (or the poor quality of what little IS posted) that the reality does not match the hyperbole, yet. Technology moves pretty quickly, on the whole. But we've been waiting YEARS for the reality of open keyboards to match it's potential. Still waiting...
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An arranger is just a tool. What matters is what you build with it..!