I did not mean to put Gerbo off, it was just meant as a joke
To give a practical example:
In my last song I had a string line in the accompaniments in 5ths. The song was in F so when changing to the relative minor of Dm the string line would normally change from C to A.
To make the backing more harmonically interesting, I wanted to keep the strings in A for these particular measures, while the rest of the bass and accompaniment went into the relative minor. Thus the high strings would sail on regardless as the rest of backing changed gear, a very interesting effect.
In the past this was easy to do after the event in a sequence, because you just went into note edit and changed the note in the measure you wanted. But you could not neccessarily play it live in all circumstances in just that measure in a song you wanted it.
The chord modify change enables you to choose not only how each track of the accompaniment reacts to chord changes, but each individual note of the accompaniment can be programmed to respond in a different way to each other note in any track.
Thus I could go to the composer and change the behaviour of this note in this accomp track to keep the A constant, while the rest of the accomp reacted to the relative minor chord.
I have often mentioned the chord modify change in the past but never with much feedback, since I think it is one of the big advances on the Kn6000 giving great flexibility for a really harmonically rich backing - sounding quite unlike the general pattern generators on much rival gear. There are 23 types of response to chords programmable for each note and track in the accompaniment. Highlighted it enthusiastically on page 49, for those interested.