FWIW ..

Yup, I do use button #1 quite a bit.

It gives the ability to have the same note on
push & pull (using the first 2 buttons).

Which allows for some flexibilty in that low register.

I think it's even more useful on my high-F box,
'cause the whole low-register becomes useful.

I've never heard of a tuning scheme such as wle's
but it sure sounds interesting :-)

--Big nick

Button # 1 is as practical as any other button. Took me a couple years to appreciate it.