I'm just curious, but do any of the players for software collections like this do the note 'bending' trick that all arrangers do to compensate for 'late' chord entry (you know, you play the right chord 1/16 late, and the arranger bends ALL of the 'wrong' notes from the previous chord to the 'right' ones without re-triggering them - it's what makes things smoother)?

Without this ability in the playback engines, I can't see how something like this is of much use to the arranger community other than some extra RH voices. Not that there's anything wrong with that, but maybe some need to realize this is not going to help the 'auto' part of the arranger (except drums and perc), probably the thing that needs it the most!
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An arranger is just a tool. What matters is what you build with it..!