First, in my post on the Chromatic "B-griff" keyboard I had said:
I had come to the conclusion that the set-up of buttons must be from the Chromatic Piano Accordion, but as I have never played one (only a Piano Accordion) I had no idea how the notes were made up.
I then had this from Den:
Hello Hugh. Just a small correction: "Chromatic Piano Accordion"?? It is a Chromatic Button Accordion. The piano is still a chromatic keyboard as opposed to a diatonic keyboard where there are only white notes and you get a different sound whether you push or pull. Saying a "Chromatic Piano Accordion" is like saying a Ford Toyota .. both are cars but wildly different. Sorry about that but I am jealous of my button accordions.
So I have corrected that now.
Conversation continued as posts, below