It's just that, I was always under the impression that SA voices meant 'Super Articulation', and just wondered WHAT got 'articulated'.

Sounds rather like simply a better sampled regular voice, from your description, Ian... I hope Yamaha aren't using SA to describe voices that are better suited to the 'Live!' or 'Cool!' categories to pump up their stats.

BTW, quick rant... What's with all this Live! Cool! and Sweet! BS? Wouldn't a more accurate description (say 'stereo' or Vel-Xed) be more informative?
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An arranger is just a tool. What matters is what you build with it..!