Part of the myth of 'open' keyboards is this assumption that, once you buy the hardware, software will keep it contemporary into the far future...
Now, I don't know about you, but I keep a fairly careful eye on the state of audio software and computers. I've been using them for decades now (well, over one decade, anyway!). And probably the first thing you learn is, it doesn't matter how powerful a computer you have, someone WILL make a program that taxes it beyond it's capabilities. This is especially true when it comes to VSTi's.
The realtime generation of synth and sampler sounds, with programming FAR in excess of hardware capabilities comes at a price. That price is the need for the latest computer hardware, and the latest computer OS's. This is what all the 'open' users like to forget about (or rarely discuss, at least). Both of our most vocal 'open' arranger users here (abacus and Fran) admit that their hardware needs upgrading considerably before they can even run the CURRENT OS and VSTi's, yet alone any future ones. So much for 'open'....
The Oasys has, I think, fallen into the same hole, touting itself as 'open' but without an easy processor upgrade path, not to mention all the periphery hardware. At it's highly elevated cost, it's users were expecting just a bit more than the 'Triton on steroids" they got... There has been next to no groundbreaking software added to the system, and bugs have been extremely slow to squash. And, for a fraction of the price, anyone can put together a computer system with hardware synths that not only rivals it's sound, but is FAR more easily upgradeable.
Let's face it, folks... What on earth is the point of putting DAW capabilities in a hardware unit? The entire industry has gone software. Pro-Tools rules the roost, with Cubase, Sonor and Logic vying for the 'composer' field. All of these programs dwarf ANY hardware's capabilities, at a fraction of the cost. The Oasys (and I believe the FantomG and other DAW equipped keyboards) are trying to address a market that just doesn't exist. Anyone worth their salt is working with computers, and the remaining computer-phobic wannabes are not a big enough market segment to allow continuing development of hardware (a far more costly endeavor than writing software).
It is time for keyboard manufacturers to concentrate on making the best KEYBOARD they can, not a keyboard/DAW/VSTi host hybrid that will always be outperformed by separate components.
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An arranger is just a tool. What matters is what you build with it..!