So when you say "intelligent tracking" - if you don't strum a full chord slightly ahead of or at least immediately upon a chord change in the progression, can the harmonies keep up with or in reality anticipate the change? Obviously I don't know exactly how to ask this.
If the harmonies sound like humans I'm sure that would be a great tool. I have definitely been tempted, but would have to put pitch correction at the top of my desired feature list.