Thanks @Basslint, I'm still undecided about the green background on toolbar buttons, the icons contain many colors and they play better with a blue background i guess.
Probably icons need a redesign for this theme, I was thinking about monochrome (or two colors) icons, like Ardour or Zrythm, but this will be quite an effort unless we can find a way to make a bulk conversion.
[EDIT] Pushed Muse theme to gitlab:
https://gitlab.com/lam604/audiothemes/- ... 4.0/themes