Could it be that this represents a system for generating music?

[Bluetoes101]

Therefore, the content of this manuscript might consist of symbols intended to facilitate such oral transmission.

Isn't that what letters and words are?

This may be the only time I'm more qualified than most here.. I thought "yes", but maybe with choirs "not always", its not something I know much about..
The "GPT" found something interesting You are not allowed to view links. Register or Login to view.

"A close look at texting practices in several 15th-c. MSS supports recent scholarship concerning the performance practice of textless lines in polyphonic music. I-Fn, MSS Banco Rari 230 and 337 supply partial text for lower voices in a manner that suggests that textless vocalization of much or all of the lower parts was a common practice in Northern Italy. Similar texting practices in E-E, MS V.III.24 and GB-Ob, MS Canonici misc.213 indicate a similar practice in Venice and Burgundy." 
 
I haven't had time to read through it today, other than an AI "TLDR" (which I don't trust enough to comment), but I'll try get to it tomorrow and either way seems an interesting avenue to explore for Maruyama Toru.  (I also have no clue how to remove the user tag caused by copy pasting a name even though I first pasted into notepad..)[url=https://www.voynich.ninja/user-4139.html][/url]