I admit I don’t know for sure but if you enter standard chord progressions, Natural Arrangement is not a factor. C Am F G7 always had BIAB playing things like Cmaj7 Am7 F7 G7b9 just because BIAB always used AI to ‘jazz it up’ unless you specifically said not to and used a very simple style.

No, where Natural Arrangement makes changes is if you enter more complex upper extensions like C13(#11) Am11 F13b9 G13sus. It’s very likely the RealTracks that were recorded by the artists did not play this exact progression. Yes, BIAB could play those chords but most keyboard and guitar players would simplify it. That’s what I think Natural Arrangement does. I think...


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