(There's no video for MacSpeak yet. Please contribute to MR and add a video now!)
This is the origonal speech synthsizer app that Steve Jobs used to make the mac 128k demo.
(PS: I can't belive how long it took to find this!)
MacSpeak.dsk (400 KB)
MacSpeak / Mini vMac DSK boot disk file
53 / 2017-03-10 / 2017-03-12 / c8958ac92cc58df97cef361383997a2cdb96c516
So far, I only have the Mini vMac file. I will try to post the .sit file too!
Emulating this? It should run fine under: Mini vMac