Excellent effort. If someone could hack a Macintosh PowerExpress Prototype chime onto one of these, I would go out and buy a B&W G3 just to be able to do it.

You know, these ones...

Macintosh PowerExpress Prototype Boot Chime - 60KB

Macintosh PowerExpress Prototype "Saved Company" Chime - 125KB

Macintosh PowerExpress Prototype "Kill Me!" Death Chime - 115KB

I may have to start digging through the PEx ROM dump and hope for the best in sourcing up clean, digital copies of these.