Jill: The ONLY difference is that 'Fingered' mode requires that at least a 3 note chord (root, 3rd & 5th) be played while 'A1 Fingered' will (in addition) recognize the triad when only 2 notes (root & 3rd) are played. BOTH 'Fingered" & 'A1 Fingered' recognize standard root included as well as rootless 'jazz' type chord voicings. I typically play in 'Fingered' mode, but I may now switch to 'A1 Fingered' for its added chord option.

Scott