It struck me while participating in these threads:
that it might be worth trying to do a survey on the different variations on the Jeffries 39 button anglo layout - we might even include the larger 45+ versions too. For some reason, this particular layout seems to have so many variations, that it is easy to throw up one's hands and simply declare that there is no (and perhaps never was any) standard layout. That said, when you have seen a number of these instruments, it is possible to perceive certain trends. For example: RH button 5b is often the reverse e/f (draw/push) and 6b, the reverse d/c, which in practical terms means you can complete the diatonic c octave in both bellows directions with only 2 additional buttons. Another trend is the RH push f# on button 1b and the push Bb on 10 (accompanied by the shift of the high f# to button 7c, mentioned in David's topic above)
Anyway, with Gary's new numbering system up and running so to speak, we could actually reduce this survey to a simple spreadsheet - not quite sure how that works on this site, but I'm willing to try to keep one going for the duration of this topic and post it here once there is enough data.
Anyone else think this would be useful?
PS. Here's a link to my own layout below, that I posted to the other thread last week
Edited by adrian brown, 12 February 2018 - 05:32 AM.