I have 2 buttons just like a regular one row (c on push and g on pull)
all the other pairs are the same push or pull--no difference--F pair, D pair, and G pair. If I redo it, I will change the C/G pair to a C both ways. It works great and makes for a very smooth accompaniment even though you have to push and pull for alot of changes on the treble side---the bass remains correct for the chord changes of the song.