found it: first speech synthesizer (at least, for S-100 systems)

[Bob Smith]

We had a Votrax in our lab at DEC around that time, we set it up with
a photo detector to trigger a phrase when someone walked by. IIRC
programing the sounds used a phoneme library... that was fun figuring
out before we finally got the manual!!
bb

On Wed, Dec 16, 2020 at 11:14 AM Chuck Guzis via cctalk
<cctalk at classiccmp.org> wrote:
>
> I sent away for the Computalker demo cassette tape back in the day.
>
> Maybe a copy is still on the web.   I thought it was hilarious,
> particularly the singing.
>
> Now we get synthesized junk phone calls...
>
> --Chuck