It’s referenced here:
http://mirrorservice.org/sites/ftp.cdrom.com/pub/cdrom/cdrom...
search for “Professor X”. I first used a MacinTalk HyperCard plug in and later used a PlainTalk plug in.
That was actually my second version. My first version was written in AppleSoft Basic for the Apple //e and used Software Automated Mouth (https://en.wikipedia.org/wiki/Software_Automatic_Mouth)
Here is the Usenet reference. The professor still works for the same University.
https://groups.google.com/forum/m/#!search/HyperCard$20gcedu...