Gday Jerry,

The Hayden System may well be very logical ... Richard Evans, in the Blue Mts behind Sydney, is thinking of making one ... I'll have to try it out if he does.

(I must say, I suspect that the layout of the Continental Chromatic Accordion/Chromatica could be well adapted to a duet concertina - but I haven't gone so far as to lay one out to see how practical it really would be! Ayway, there seem to be more systems already in concertinas than almost any other instrument!)

Regards,

Bob Bolton