Also, check the phrases I have tried to underline (in italics) in my previous posting:

(AI Full keyboard): This type is similar to Full Keyboard, with the exception that less than three notes can be played to indicate the chords

So this means that in Full Keyboard mode you need at least three notes to identify a chord.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.