It's possible at the moment to have multiple keygroups overlaid on one another, by pressing several of the split outputs at once when holding the main mode key. Of course none of the splits in the factory setups have keygroups in the same place as each other so you end up playing a note on one group while prodding the menus on the other.
If you could build a setup that had say three splits, each with identically shaped and positioned keygroups, then you could load the same instrument into each keygroup and then muck around with the scales and course offsets to get chords. For example you could stick with a chromatic scale on C (or for accordion go for a circle of fifths), then set the course offset on the first keygroup to 0, giving the same notes in column 1 and 2. On the second keygroup you could set the starting note to E, and use a course offset of -1 to put the minor third (Eb) on the second column. Start the third keygroup at G and have the course offset be 0 again and you then have a column of major triads, and a column of minor triads.
You can stack up other layers and other chord types by using more keygroups and carefully chosen course offsets.
I haven't got round to this, for two reasons:
- It requires some heavy belcanto to build splits, keygroups, and wire up instruments (although all of these are covered in the seminars on the wiki).
- I can't figure out how to get Kontakt 4's accordion sound to react nicely to breath pressure rather than just velocity.