You were almost there:
%%%%%%%
\relative {
\time 3/4
\key f \major
\clef bass
\mergeDifferentlyHeadedOn
<<
{ \voiceThree <\tweak duration-log #2 g df'>2 * 1/2 g4 <gf df'> | }
\\
{
\voiceFour \override Beam.details.collision-padding = 0
\scaleDurations 2/3 { g8 bf bf g bf bf gf a a } |
}
\\
{ \voiceSix \override NoteColumn.force-hshift = 0.5 ef2 ef4 | }
>>
}
%%%%%%%%%
> 15 feb. 2022 kl. 21:09 skrev Knute Snortum <[email protected]>:
>
> Hello again.
>
> I am having difficulties engraving a complex three-voice lefthand
> measure. Chopin (bless his heart!) has written some "impossible" note
> lengths. I have two ways that get close to engraving the measure as
> Chopin wrote it, but not quite.
>
> Attached is the measure I want to engrave, then my two attempts, then
> the input file that created the two attempts. Any suggestions would
> be appreciated.
>
> --
> Knute Snortum
\version "2.22.1"
\language "english"
voiceSix = #(context-spec-music (make-voice-props-set 5) 'Voice)
% df' doesn't connect with g
\relative {
\time 3/4
\key f \major
\clef bass
<<
{ \voiceThree df'2 * 1/2 g,4 <gf df'> | }
\\
{
\voiceFour \override Beam.details.collision-padding = 0
\scaleDurations 2/3 { g8 bf bf g bf bf gf a a } |
}
\\
{ \voiceSix \override NoteColumn.force-hshift = 0.5 ef2 ef4 | }
>>
}
% g is headed as a half note instead of quarter note
\relative {
\time 3/4
\key f \major
\clef bass
\mergeDifferentlyHeadedOn
<<
{ \voiceThree <g df'>2 * 1/2 g4 <gf df'> | }
\\
{
\voiceFour \override Beam.details.collision-padding = 0
\scaleDurations 2/3 { g8 bf bf g bf bf gf a a } |
}
\\
{ \voiceSix \override NoteColumn.force-hshift = 0.5 ef2 ef4 | }
>>
}>