Thing is, even compared to YAMAHA acoustic pianos, Yamaha arranger pianos lose something, Scott. Sure, it's not as big as from Yamaha to Steinway, but that all important center area where you do most of your comping, that's the area I find the most difference.
Plus, I play the CIIIF in a dead studio, so I'm not having the room really affect things too much. From G an octave and a half below middle C to the G an octave and a half above, that's a CRITICAL 3 octave area for comping, and IMO generally the weakest area in ANY piano sample set. Trust me, I'm not on a Yamaha bashfest. Even most Roland pianos, Korg pianos, you name it (even a bunch of VSTi pianos) have problems here.
BTW, how many vel-splits do all these Yamaha arranger sets have? That, IMO, makes the biggest difference, as you aren't trying to emulate timbral changes with programming, you get it in the raw sample. I can't WAIT to try that KRONOS 12-layer one!
I really hope the Kronos's SSHD sample streaming becomes the industry standard. That's going to revolutionize piano sounds...
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An arranger is just a tool. What matters is what you build with it..!