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## Re: Bug with alternativeRestores

 From: James Lowe Subject: Re: Bug with alternativeRestores Date: Fri, 27 Apr 2018 11:48:30 +0100 (BST)

Hello,

I've created

https://sourceforge.net/p/testlilyissues/issues/5315

To track this issue.

Thank you.

James

On Mon, 23 Apr 2018 22:19:05 +0100 (BST), "James Lowe" <address@hidden> wrote:

> Hello Steven
>
> On Mon, 23 Apr 2018 19:33:34 +0000, Steven Weber <address@hidden> wrote:
>
> > No, that is the problem.  If you look at the file, you'll see in the first
> > example, I switch the time from 2/2 to 3/4 in the first alternative, and
> > then Lilypond automatically returns the second alternative to 2/2 time.
> > However, when I do the metadata/notes in separate variables, the automatic
> > switch from 3/4 back to 2/2 does not occur (and hence, you get all the
> > barcheck errors).
> >
> > --Steven
> >
> > ﻿On 4/23/18, 11:59 AM, "James Lowe" <address@hidden> wrote:
> >
> >     Hello,
> >
> >     On Thu, 29 Mar 2018 19:53:05 +0000, Steven Weber <address@hidden> wrote:
> >
> >     > AlternativeRestores seem to work fine as long as your metadata &
> > notes are in the same block.  If you separate them into a metadata variable
> > and a notes variable, the second alternative is always in the same time
> > signature as the first alternative.
> >     >
> >     > This is against lilypond 2.19.81 on Windows.
> >     >
> >     > --Steven
> >
> >     Your example is giving me barcheck errors for those entries using the
> > \skip values.
> >
> >     Is this just a problem with your example?
> >
> >     James
> >
> >
>
> We also had this reported by another user last year - something was nagging
> me at the back of my brain that I'd seen this recently, and so I dug back
> through the bug list emails and found it:
>
> https://lists.gnu.org/archive/html/bug-lilypond/2017-09/msg00022.html
>
> (not so recent I guess)
>
> and I didn't see any reply/confirmation of this being a bug by those that
>
> The workaround from the other user is to explicitly put the time signature
> directly in the alternate's construct .
>
> e.g
>
> {
>       \time 2/2
>       \clef bass
>
>       \repeat volta 2 { \skip 1*2/2*1 | }
>       \alternative
>       {
>               { \time 3/4 \skip 1*3/4*1 | }
>               { \time 2/2 \skip 1*2/2*1 | } % <---- add the \time 2/2 here
>       }
>       \skip 1*2/2*1 |
> }
>
> notes =
> {
>       \repeat volta 2 { c2 e | }
>       \alternative
>       {
>               { f4 e d | }
>               { \time 2/2 f2 d | } % <---- add the \time 2/2 here
>       }
>       g1 |
> }
>
> Then it compiles (without bar check warnings) OK as far as I can tell.
>
> I think that LilyPond is just not able to cope with the ambiguity of the mix
> of time signatures in the alternate repeats when you use a << >> construct.
>
> So the issue is (again I think I am not qualified to say for certain) not
> with the alternate restores but the simultaneous construct but I don't think
> this is a bug but a feature.
>
> Maybe others in the dev team can comment and perhaps we can add something to
> the doc (if it is not a bug) as a 'Known issue'.
>
> Regards
>
> James