By gosh DonM, you are right.
I guess I have been using the "fingered mode" but just had never given a thought about the chord staying on the 'same' chord until at least another 3 note chord was played again. Makes sense, I'll now try playing around with left hand fills/riffs

BTW: Can someone tell me "which" arranger keyboard(s)/models (if any) allow you to split the keyboard and allow you to play bass lines in the left hand and have the right hand play (piano comping chords) which trigger the arranger keyboard to produce the correct backup auto-accompaniment parts? The Technics KN5000 only allows you to trigger chords in the LEFT part (split mode) of the keyboard or ENTIRE keyboard (pianist mode). The KN5000 does not allow you to set up the RIGHT part for triggering auto-accompaniment chord recogniton.
Thanks, Scott