I would try to only lower pitches, as I believe that is less invasive (using solder). On Fri, Oct 2, 2020 at 8:03 AM Arthur Jennings via Harp-L <harp-l at xxxxx> wrote: > How would you go about retuning a solo-tuned harmonica to diminished > tuning? Would you raise the pitch of some reeds and lower others or only > raise pitches?