Thanks for that Matt. I think there is some general confusion amongst musicians about what constitutes a true key change. Some think any modulation can be considered a change of key. But I think after reading your comment this isn't necessarily so. Ha ha, you've got me scouring the internet for knowledge on the subject. To date I can't find a dispute to your argument.

Also thanks for the reassurance that BIAB AI looks ahead and I don't have to worry if it will get things mostly right. It's a load off my mind to know that I can just enter my lead sheets and go with it.