I sent the last prototypes to a couple of Beta Testers (Actual Composer/Music Producer, no Youtubers) and took their feedback to make a lot of Hardware/Software improvements.
If you're a professional Music Producer and want to test a Prototype, just send me a mail via the website.
The next batch of Prototypes, planed for EoY, will be a bit bigger, to get even more feedback and there are a lot of requests from reseller that want to try it out extensively (Thomann for example). I'll also have to do a new EMI/ESD check (hopefully the last one)
As I said in another comment, I aim to have a Batch of 100 ready for sale around May next Year. But lets see how this plays out. Hardware is hard ;)
Interested to hear more about your experience with VexFlow if there's anything more to share on top of it being "very nice". :)
I think VexFlow was one of the projects I encountered when I was recently looking for musical score rendering solutions for a somewhat non-typical context[0].
In the end I settled on using a Standard Music Font Layout (SMuFL) reference font directly rather than a higher level engraving library which led to a result that was...mixed. I share (a.k.a. rant about :) ) my experience more toward the end of a HN comment[1] in case the topic is of interest.
[0] A 7-day game jam entry created with Godot 4: https://rancidbacon.itch.io/stave-off
Edit: I looked at your stuff, did you know about:
https://guides.loc.gov/music-notation-preferred-preservation...