A baritone Lachenal I have has the frame of the low F on the right hand side marked as a F. However someone sometime has tuned this up to a G#, duplicating the Ab on the left hand side.
Does the community have any opinion on whether the reed will tolerate tuning back down to F?
It's nice to have the extra versatility that a low F offers on a baritone. I'm prepared to have new steel reed vibrators fitted if necessary.