Re: A staff change and phrasing slur problem

[Robert Blackstone]

Hi Urs,
Thanks for your explanation and advice (and my apologies for my late reaction. 
Some urgent matter temporarily took me off my engraving activity.) 
So I still have to try out your suggestion. 

I am still puzzled though, for while I can understand that different voices 
cannot be connected by spanners etc., in most instances up till now, with 
identical coding (as far as I could see) the problem did not arise.
I am also a bit puzzled about what  you write near the end of your mail: 
"Actually I would really not create temporary polyphony for each measure as 
this makes things *very* complicated."
Not for each measure. But only for some measures? Or is there an alternative 
that you would use? 

I'll first experiment a bit with your remedy. 

Thanks again.

Bewst regards,
Robert


On 14 Feb 2017, at 14:37 , Urs Liska <address@hidden> wrote:

> 
> 
> Am 14.02.2017 um 14:27 schrieb Robert Blackstone:
>> Dear all,
>> 
>> I have been struggling for many hours with a pianoscore in which the mostly 
>> polyphonic text regularly switches between the treble staff and the bass 
>> staff.
>> There should be (phrasing-) slurs joining the beamed groups of notes.
>> Sometimes these slurs do not appear, as in the upper voice  between b.2 an 
>> b.3 in the ME.
>> Probably I do something wrong but I have not been able to find out what.
>> 
>> Can someone help me out?
> 
> The actual problem is that the notes are encapsulated in different Voice
> expressions and therefore can't be connected by spanners such as slurs
> or \< \! etc.
> 
> When you write
> c' << { d'' } // { d' } >> c'
> LilyPond creates two temporary voices for the d-s (and make them
> \voiceOne and \voiceTwo implicitly), while the original voice is
> suspended during the polyphonic section.
> 
> In order to connect notes from inside the polyphonic section to the
> outside you'd write
> 
> c' << { \voiceOne d'' } \new Voice { \voiceTwo d' } >> \oneVoice c'
> 
> This way the main voice is continued through c' d'' c' while only the d'
> is wrapped in an implicit temporary voice.
> 
> With this information you should be able to disentangle your example.
> Actually I would really not create temporary polyphony for each measure
> as this makes things *very* complicated. But of course this may be
> related to your real-world example.
> 
> HTH
> Urs
> 
>> 
>> Thanks in advance.
>> 
>> Best regards,
>> 
>> Robert Blackstone
>> 
>> 
>> %%%%%%%%%%%%%%%%% 
>> \version "2.18.2"
>> 
>> upper  = {
>>  \clef treble
>>  \time 3/8
>> s8 s8 s8 | %1
>> s8 s8 s8 | %2
>> s8 s8 s8  | %3  
>> }
>> 
>> lower = {
>>  \clef bass
>>  \time 3/8
>>  << { a8 [ b ]  \( c' [  \)  }  \\ {\stemDown  c8 [ d ]\( e [ \)  } >> | %1
>> << { d'8 ] \( \change Staff = "upper" e' \) [ f' ] \(  }  \\ { \stemDown f8 
>> \(  ] g \)  [ a  ]  \(   } >> | %2
>> << { \change Staff = "upper"  g' \)  [ a' b' ]   }  \\ { \change Staff = 
>> "upper" \stemDown b \)  [ c' d'  ]  } >> | %3  
>> }
>> 
>> \score {
>>  \new PianoStaff 
>>  }
>>  <<
>>    \new Staff = "upper" \upper
>>    \new Staff = "lower"  \lower
>>>> 
>>  \layout { }
>> }
>> %%%%%%%%%%%%%%%%%%%%
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> 
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