Apologies for continuing way off the topic of right hand chords...
Perhaps this numbering system might work for 38-button Jeffries Anglos? (See attached):
Starting with the core 20-button numbering of 1-10 on each side, and with the top rows of accidentals numbered 1a-5a on each side...
Since we already have extra buttons above labeled with an extra "a", how about labeling extra buttons to the side with an extra "b" (based on the nearest horizontal button on the row), and labeling extra buttons with a "c" if they are below the closest button?
Above = "a"
Side = "b"
Below = "c"
And then just "Th" for the left hand thumb button since it's way different than the others.
45-button Jeffries Anglos have additional buttons only on that bottom row, so this system should work for them as well.
But whatever we end up deciding, let's please don't use all those crazy button numbers that are found on Chemnitzer concertinas (0/0, 1/0, 2/3, *, -, +, etc.)!
And for the 40-button Wheatstone - what to do since it has top rows of 6 and 7 buttons?
Edited by gcoover, 05 February 2018 - 01:37 AM.