Re: Ottava bracket in one voice

[Nick Payne]

On 04/03/13 20:24, Colin Hall wrote:
> Nick Payne writes:
>
> > I just encountered issue 1473 (ottavation marking in one voice affects
> > all voices on the staff), and it took a bit of digging to find the
> > solution (change Voice.middleCPosition in the other voices). Maybe there
> > should be a short "Known issues and warnings" in the section of the NR
> > dealing with ottava brackets - all the examples shown there are a single
> > voice.
> That sounds like a good idea, Nick. Would you mind drafting some
> suitable text and sending it in?

Colin

Is the suggested text and example below clear or not? I grabbed the 
example notes from a question on the lilypond user list a couple of 
years ago, which seemed to demonstrate more clearly than anything else 
the problem and how to solve it: 
http://comments.gmane.org/gmane.comp.gnu.lilypond.general/61276. I guess 
that any work done on issue 1473 would affect this as well.

This is for a "Known issues and warnings" paragraph to be placed at the 
end of the subsection on ottava brackets in NR 1.1.3 Displaying Pitches.

"If you have more than one voice on the staff, setting ottavation in any 
voice will transpose the position of notes in all voices for the 
duration of the ottava bracket. If the ottavation is only intended to 
apply to that one voice, you can set the middleCPosition in the other 
voice(s) to stop them being transposed. For instance, in this example, 
set Voice.middleCPosition in the upper voice for the duration of the 
ottava bracket in the lower voice in order to prevent the tied chord in 
the upper voice from appearing an octave higher than it should. Note 
that the value you need to assign to middleCPosition will vary depending 
on the both the ottavation and clef being used.

\relative c {
  \clef bass
  <<
    {
      <fis cis' g'>1~
      \set Voice.middleCPosition = #6
      <fis cis' g'>4
      \unset Voice.middleCPosition
    }
    \\
    { r2. \ottava #-1 <b,,,~ bes'^~>4 <b bes'>4 \ottava #0 }
  >>
}