Re: NOT merging same notes in different voices

[Leo Correia de Verdier]

Other than setting the stems to the same direction you can also use 
\once \override NoteColumn.force-hshift = 1
(or -1, depending on what voice you want first).

A clarification: Voices have settings for stem direction and shift. For the 
noteheads not to be merged they need to have the same stem direction and 
different shift settings (or no shift setting at all, but then they throw a 
warning, like in jJean-Julien’s suggestion). The \voiceXxx commands do not 
create or change voice contexts, but only change these settings (and the 
directions of articulations and slurs). These settings can also be changed 
individually with \stemUp \stemDown and \stemNeutral resp. \shiftOn and 
\shiftOff. For instance \voiceOne and \voiceThree sets stems up and \voiceTwo 
and \voiceFour down, \voiceOne and \voiceTwo sets shift off and \voiceThree and 
\voiceFour set shift on.

HTH
/Leo

> 11 jan. 2023 kl. 16:18 skrev Johannes Roeßler <joei@joei.de>:
> 
> Hi Group,
> 
> how can I avoid that the same notes in two voices are merged?
> 
> \version "2.24.0"
> <<{ a'4 }\\{ a' }>>
> 
> Best regards
> Joei
>