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| From: | Auto mailings of changes to Lily Issues via Testlilyissues-auto |
| Subject: | [Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5431 Articulate.ly: articulate script introduces wrong musical content, that is not present at the input |
| Date: | Wed, 24 Oct 2018 10:56:28 -0000 |
[issues:#5431] Articulate.ly: articulate script introduces wrong musical content, that is not present at the input
Status: New
Created: Wed Oct 24, 2018 10:56 AM UTC by pkx166h
Last Updated: Wed Oct 24, 2018 10:56 AM UTC
Owner: nobody
Attachments:
On 24/10/2018 10:53 am, David Baptista wrote:
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.
See screenshot1.png or 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.
See screenshot2.png or 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).
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).
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
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