I believe that the Korg option applies to envelope behavior of monophonic sounds, but NOT to completely different samples between staccato and legato, not to intervalic rules.

The Yamaha behavior IS complicated because of velocity AND legato combinations, and intervallic rules as well. That's what makes it so 'human'.

But think for a minute about 'legato'. The very nature of it in acoustic instrument DOES mean it isn't played as hard... You can't put as much force behind a legato line on a wind instrument as you can a staccato blast... and a string that is hammered on, or played legato ISN'T re-picked, and IS quieter than a picked one.

It really DOES mimic natural playing techniques in many instruments. I am looking forward to seeing how far ahead the T3 can push this technology. It truly doesn't have ANY hardware equivalent, yet, IMO...
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An arranger is just a tool. What matters is what you build with it..!