I think that the commands that configure single-staff polyphony should set
Voice.BreathingSign.direction. Does anyone know of a reason not to change the
current behavior?
```
\version "2.23.13"
upper = \fixed c'' { c2.-. \breathe d4-. | c2.-. \breathe d4-. }
lower = \fixed c' { a2.-. \breathe b4-. | a2-. \breathe d2-. }
\score { << \upper \\ \lower >> }
\score { \partCombine \upper \lower }
```
Thanks,
—
Dan
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