I think that that list of Spalding's is achievable at exactly the same price that T2's currently run for... Nothing of what he asks for isn't already available on either an arranger or a WS that is already considerably cheaper than the T2. In fact, all he's asking for is software, probably the cheapest thing to develop...

Roland's and Korg's have full featured sequencers with touch screen control (cheaper than T2 or equivalent, Korg have a full featured sampler with FAR better editing, and a vaster potential library by being Akai aware. Most top out at 192MB, but that's plenty. Most WS's will sync audio to sequencer. Load times ARE improving, but may never reach computer speeds, but at the moment, even computers can't retain the memory after power down. But no big whoop if the load times ARE at least an order faster than my Kurzweil (12 year old design, and STILL capable of 1MB/sec).

As long as sample load doesn't interrupt arranger play, load time isn't quite the bottleneck it currently is...

No, I honestly think that, except for the flash RAM thing (that even computers can't do), all of his requests exist in current keyboards. Just not assembled into one yet, other than the PA2X (without speakers).

Which begs the question... why hasn't some enterprising company built some good quality, low profile speakers that you can simply clamp to a PA2X..? I am not sure that, if the choice was between going without the features you mostly requested for the sake of built in speakers, or just finding a nice set of satellites that could easily be clamped or Velcro'd to an existing speaker-less PA2X (which has the vast majority of what you request), that I would have the patience to forego what I want in the vain hope that MAYBE, someday, someone brings something out with ALL I want in the same package.

Far better to get the closest compromise until the real deal comes out than have none at all, IMO... If that involves using a pair of satellites, so be it...
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An arranger is just a tool. What matters is what you build with it..!