Today I have taken delivery of my Frank Edgley thirty button anglo concertina which was secondhand. It has a Carroll layout which I notice is identical to the Jeffries layout except for the push on the first button right hand side, top row, is a C# and the Jeffries has a D# there. So I have a C# in both directions on that button
I have no less than 3 x C#3s on that row which I think is good for Irish music though I'm not experienced enough to say for sure.
I notice though that the Wheatstone layout has 6 different notes (to my layout) on the top right hand side row.
Can anyone explain the logic behind these layouts?
Many thanks if you can!