Re: Articulate script plus grace notes following multiple voices results in timing errors

[James Lowe]

David,

On 24/10/2018 10:53 am, David Baptista wrote:
> I think it is a single issue, but because it happens at the music 
> expression level, it can manifest itself in both engraving and midi 
> "rendering". Essentially the articulate script introduces wrong 
> musical content, that is not present at the input, under certain 
> conditions (an hypothetical parallel to help categorize the issue 
> would be if articulate always added a whole bar full of C#'s to the 
> music - it would be a glich present in both midi and engraving 
> output). In this case we are talking about adding extra 
> time/pause/rests to the music when articulate processes a music 
> expression where grace notes follow the use of multiple voices. Examples:
>
> http://lilybin.com/97o636/2 - Here you cannot see the glitch visually 
> because the articulate output is not engraved, only used for midi 
> output. But you can hear from the midi output that extra time has been 
> added to the top staff after the grace note, resulting in that staff 
> being out of sync with the staff below.
>
> http://lilybin.com/97o636/1 - Here you can see the glitch visually 
> because I rendered the articulate output (I understand no one in their 
> right mind would do this in a normal scenario, but I believe it is 
> helpful here because we can visualize the extra time that has been 
> added, confirming that this is not a midi rendering problem, but a 
> problem with articulate script introducing wrong musical content not 
> present at the input).
>
> (Because GNU's mailing lists archives aren't always easy to follow, an 
> easy to follow thread archive with the previous discussion of this 
> issue is available at 
> http://lilypond.1069038.n5.nabble.com/Articulate-script-plus-grace-notes-following-multiple-voices-results-in-timing-errors-td212650.html)
>
> Where does this manifest in regular use? Essentially in piano and 
> orchestral scores, where use of multiple voices within a staff are 
> common and grace notes are relatively common. Users with this use case 
> relying on articulate to produce "better than bland" midi output will 
> suffer from midi output with timing issues (essentially resulting in 
> wrong playback with some staves being out of time with the rest of the 
> music). The workaround as of now requires rewriting the music to avoid 
> having grace notes following multiple voices (in my case this forced 
> me to have different musical expressions for engraving and for midi 
> output).
>
> Best regards,
> David Baptista

Thank you for that.

I'll take what you have written here and us it to create a new tracker 
for this and send an email to the list with the URL/number.

Jamess



> James Lowe <address@hidden <mailto:address@hidden>> escreveu 
> no dia quarta, 24/10/2018 à(s) 09:16:
>
>     Hello,
>
>     On 22/10/2018 5:57 pm, David Baptista wrote:
>     > Did this bug end up being materialized on the tracker? (I was
>     looking if
>     > there had been any follow-up on the sourceforge bug tracker but
>     was unable
>     > to find it there).
>     >
>     > Best regards,
>     > David Baptista
>
>     No it does not look like anything was added to the tracker based
>     on the
>     date of this thread.
>
>     However I am having a struggle understanding what the 'concise'
>     request
>     is here, to be able to add something - i.e. is it an output /
>     engraving
>     issue or an 'audio' / midi-specific issue or both (in which case we
>     probably need two trackers).
>
>     Thank you.
>
>     James
>
>
>     > Torsten Hämmerle <address@hidden
>     <mailto:address@hidden>> escreveu no dia sexta,
>     > 4/05/2018 à(s) 14:01:
>     >
>     >> David Baptista wrote
>     >>> Thank you for the speedy reply.
>     >> Ok, I admit it was too speedy...
>     >> Yes, you are right, I confirm to have the same effect here.
>     >>
>     >> That, indeed, calls for a tracker issue.
>     >>
>     >> All the best and thanks for the hint,
>     >> Torsten
>     >>
>     >>
>     >>
>     >> --
>     >> Sent from: http://lilypond.1069038.n5.nabble.com/Bugs-f58488.html
>     >>
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