pixelwise equal-length bars in notation?

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Newsgroups gmane.comp.audio.rosegarden.user
Message-ID <[email protected]> 
I need the entire notation as a long image with equal length bars. So 
far I have tried making a wide image and feeding it to kdenlive using
either equal bars at steady speed *OR* uneven speed and keyframing,
both of which require a LOT or work. What I would like to see is a
feature that takes the longest bar and makes all the others the same
length (don't think this exists).    

examples
https://youtu.be/PeU1tfS2MbM
https://youtu.be/4BAtn2hVWgs
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