She had been a singer and strongly identified her self with her voice, she wanted to be able to use a speech synthesis system that had her own voice pattern.
Apologies if this was already mentioned, but it seems to be a use others here hadn't considered.
I could see him doing such a switch for personal interactions.
> "The voice I use is a very old hardware speech synthesizer made in 1986," he said. "I keep it because I have not heard a voice I like better and because I have identified with it."
I'm not sure how sentimental he is but he does seem quite tied to that voice since there have been lots of advancements in voice synthesis since he originally got this and yet he's chosen to keep this one.
Should be just as possible in the present or near future.