"Stem #'neutral-direction = #up" versus \stemup

[Peter Terpstra]

Dear Readers,

I don't get this.

\stemup gives me a lot of errors but works, "Stem #'neutral-direction = #up"
does nothing. Its about the middle (Alt) voice.

This is the case:
~ Start snippet
        \relative c''
% Treble
<<      {  \repeat volta 2 {                 
        < g,= b > 4< a c > < c e > | < b d > 4.< g b > 8< a c > < b d >  |   % 3
        < c e > 4< d fis > < e g > | cis! d r | \break   % 5
        < b d >4. b'8  a g  | <g-4>4 fis8 < c d > < c d > < c d >  }
}
% Alt
\\      { \override Stem #'neutral-direction = #up
        \override Stem #'length-fraction = #0.2
        s2. s   % 3
        s s   % 5
        s4. b=8  b b  s4 c4. s }
% Bass
\\      { \stemDown 
                           
        g,=,2. r4 g' r   % 3
        r8 g4 g g8 ais!  g  b4 s   % 5
        g8  d  g  d g d  s4 a'8  d, a' d, fis d }
>>
}
~ End ly snippet.

TIA,

   Peter


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