I've invented a trombone capable of hitting quarter-tone intervals. Next, I'm working on a violin that can do it.
I never could understand the whole quarter tone scale thing. When I was a music student at DePaul University in the 70s, my music theory professor was promoting it with an electronic organ developed for him by Motorola, the Scalatron. I’m not criticizing it, it just don’t see the point of it, I guess.
https://microtonal.miraheze.org/wiki/Motorola_Scalatron