the Axis-49 hexagonal array keyboard is out in General Concertina Discussion Posted July 27, 2009 · Edited July 27, 2009 by Steve_freereeder Very interesting..... Thanks to your links, I found the keyboard layout for the Axis 64 Harmonic Table (HT) here: http://www.c-thru-music.com/cgi/?page=layout_kbdmap It didn't take me long to realise that it was very much like the keyboard layout of an English concertina - well, several English concertinas laid side by side. Essentially, there are columns of buttons ascending in intervals of 5ths, just like the EC. The main differences are (i) the columns normally played by the index and middle fingers on the EC are reversed on the HT and (ii) the accidentals are shared by adjacent 'white note' columns. Am I the only person to have noticed this? I can't see anyone else remarking on this in earlier posts in this thread. I'm not sure quite what this goes to show. Maybe it demonstrates once again the underlying logic of the EC layout and its potential (like the continental button accordion) for playing in many, if not all, keys just using the same fingering pattern. Various chord shapes in different keys will also be the same. As in my opening phrase - very interesting. I am (almost) tempted to get one.