Welcome to the forum Stephen Sorry about your less than salubrious first reply above....

The number of notes in the chord is not really relevant, as the algorithms are looking at individual notes played rather than a specific preset chord structure.

These are then analysed by the NTT (or Note Transposition Tables) which reads each note you are playing - even if it is 8 notes! - and transposes each one according to the "rules" set. IE Close harmony, parallel, moveable root, fixed root etc.

So it moves the notes you are playing from the style programmed C based patterns to the chord you ARE playing. If you check out the Recognised Chord charts from the manuals of any of the arranger manufacturers you will see how many different chord structures are recognised.

Dennis