Re: autochange with multiple voices

[Thomas Morley]

2015-08-18 11:57 GMT+02:00 David Kastrup <address@hidden>:
> Nik Repka <address@hidden> writes:
>
>> I am attempting to make a scales sheet for piano.  I need to use autochange
>> simultaneously in two voices.
>>
>> I am using the syntax from this snippet page:
>> http://www.lilypond.org/doc/v2.15/Documentation/snippets-big-page#keyboards-using-autochange-with-more-than-one-voice.
>>
>> The issue I am having is that autochange only works on the top voice, and it
>> drags the lower voice up into the top staff.  Here is the code:
>>
>> \version "2.18.2"
>>
>> scaleRH = \relative c' {c d e f g a b c c b a g f e d c
>> g a b c d e fis g g fis e d c b a g}
>>
>> scaleLH = \relative c {c d e f g a b c c b a g f e d c
>> g a b c d e fis g g fis e d c b a g}
>>
>>
>> \score {
>>    \new PianoStaff
>>
>>       << \new Staff = "up"
>>          <<
>>            \new Voice {
>>            \voiceOne
>>            \autochange
>>
>>            \scaleRH
>>
>>            }
>>
>>            \new Voice {
>>            \voiceTwo \autochange
>>
>>            \scaleLH
>>            }
>>          >>
>>
>>       \new Staff = "down" {
>>           \clef bass
>>       }
>>       >>
>> }
>
> Ok, disregard my previous reply.  It turns out that the whole
> catastrophe happens _exclusively_ when the first note of the first voice
> is c' (or probably one of cis' cisis' ces' ceses').

This not entirely true.

It happens when the first note is the same as the turning point.
Because 2.19.25 allows for different turning points, we can test easily:

\version "2.19.25"

scaleRH = \relative c' { d c d e }

scaleLH = \relative c { d c d e }


\new PianoStaff
  << \new Staff = "up"
     <<
       \new Voice {
         \voiceOne
         \autochange d'
         \scaleRH
       }

       \new Voice {
         \voiceTwo
         \autochange d'
         \scaleLH
       }
     >>
  \new Staff = "down" {
      \clef bass
  }
  >>


returns badly as well.

Investgating further ...


Cheers,
  Harm