IIRC he actually ended up buying the company, or at least the technology behind that voice, because newer ones came along and put them out of business, but by then the voice was such a part of his identity he wanted to keep it.
Apparently his real voice (he finally lost the power of speech due to life saving surgery, rather than directly from his disease) was, "a rather cut-glass English one."
Biting the hand that feeds IT
