I used sell the Mac Voice Navigator (from Articulate Systems) in the 90s, which was a SCSI based hardware box that you plug into a Mac, Mac SE or Mac II. It used to use the same L&H speech recognition tech (if I recall correctly) and was called the "User Interface" of the future.

Horrible speech recognition rate and very glitchy. Customers hated it, and lots of returns/complaints.

A few years later, L&H went bankrupt. And so did Articulate Systems.

https://applerescueofdenver.com/products-page/macintosh-to-p...