Hi! I'm currently not developing new updates for this project, but have some planning in mind and in notes. Unfortunately, my ocupations will not give me time until next year, so it should wait a while to be done as a MVP.
Answering your questions:
> Could you post some sample music videos on youtube as the unity plugin is not working in the browser
I will definitively work on this.
> Also, when can we download this software for our own projects (Windows 10)?Probably early 2021 as a functional piece of software, but the code is open source.
> Will it have the ability to export the music as .mp3 etc files?
Yes, it will export as .mp3, .wav and .midi as soon as possible.
> Will we be able to use the resulting music in our own commercial projects?
Yes, you could use for commercial purposes. Credits are highly appreciable.