Bill, pretty much ALL arrangers got some kind of system to deal with playing a chord fractionally (less than one beat) late. The main way is to instantly 'bend' the note from its' 'wrong value' (you played a C chord after a G7, but slightly late - the arranger plays the G7 on the 'one', but then INSTANTLY changes it to a C chord, but without retriggering the chord) to the right one.

To be honest, I don't know of any soft arrangers, or VSTi's that can do this. Please tell me if you know of some that do...