Re: Very long half note
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In the second measure (voice of the first tenors) the word "Girolemin" continues until the 7th measure and then repeats with "min" until the 11th.
They are two long melismas perfectly reproduced from a graphic point of view.
While I don't actually use it myself*, the "melismatic.nw" object should be able to do this for you, but you will need to have layered staves.
* I may need to change this...
I would also like to be able to HEAR these two long notes both as a single voice (Shift+F5) and as a voice that "participates" in the harmony of the song.
Again, you will need layered staves.