Multiple Time Signatures across multiple tracks

[dgriessler]

Your environment

• Version used: (master branch) master
• Platform used: JavaScript or C# JavaScript
• Rendering engine used: SVG (default), HTML5 or GDI SVG
• Browser Name and Version: Firefox 69.0.2
• Operating System and version (desktop or mobile): Windows x64 desktop
• Link to your project: Github: https://github.com/dgriessler/TestHost/tree/gh-pages (for source code) Website: https://dgriessler.github.io/TestHost (for rendering)

Expected Results

I have multiple tracks and one set of tracks has a time signature 4 4 and the other set of tracks has a time signature 12 8. The tracks with a time signature 4 4 should have that displayed on their line and those with 12 8 should have that displayed on their line.

Observed Results

The 12 8 time signature is displayed on all tracks.

Steps to Reproduce (for bugs)

1. See the linked source code. The index.html contains the alphaTex currently being rendered. In a nutshell:

   \track "Soprano"
   \staff {score} \tuning piano \instrument acousticgrandpiano \ks G
   \ts 4 4 :2 g3{-} r |
   \track "Piano Accompaniment"
   \staff {score} \tuning piano \instrument acousticgrandpiano \ks G \clef F4
   \ts 12 8 :1 g2{d} |

   will show only the 12 8 time signature. The alphaTex that is currently being rendered is longer.

Possible Solution

I'm guessing that it assumes there is only one time signature across tracks. You'd have to expand it to accept multiple and draw multiple.

[Danielku15]

I think this is not how music sheets work. Time signatures are just like the tempo an element that must be the same for all instruments placed within a song. It would break almost any logic when you display 2 instruments of the same song side-by-side.

[dgriessler]

It's called Polytempo https://en.wikipedia.org/wiki/Polytempo Although rare for it to occur in one track, some composers do include it. In my case, the piano accompaniment is in 12 8 while the choral group is singing in 4 4. I can submit a feature request if that should be my next step since it doesn't sound like its currently supported.