Hi Eirik,
The simple way to do it is to manually force it with \stemUp and \stemDown
at the appropriate places; or with corresponding values using \override
Beam.position = #(0 . 0) [or whatever the exact numbers you need, measured
in staff spaces from the middle line). I don't think there's a way to
automate it, though.
\version "2.24.4"
\language "deutsch"
<<
\relative c' {
\stemUp c16 \stemDown c'' c \stemUp c,, h \stemDown h'' h \stemUp h,, a
\stemDown a'' a \stemUp a,, g \stemDown g'' g \stemUp g,, %%don't forget a
\stemNeutral afterwards...
}
>>
Cheers,
Aleksa