I have a violin part which, for some bars, split into two voices.
I first tried this : - create a violin_voice_a - add a violin_voice_b, containing rests everywhere except on those few bars where there is two voices
- stack the two vioces using a hara_kiri context for the second one in order to hide empty staves
The result is schematized as Fig 2 (see the picture)
Which is far different from what I can find in the litterature (fig 1) where, on the splitted staves but unsplitted voices, the violin_voice_a is printed on both the upper and the lower staves of the system.
How could I obtain this result automagically ?