[jackie_w]

Originally Posted by Uncle Robin

That's right, as I said: "They were not showing up in my Calibre list when I posted these screenshots two days ago, then they appeared" (e.a.) That's why it's weird, I have no idea where they came from.

EDIT:

Here's the relevant entry from the json

tts_sapi": {
"rate": 2,
"voice": "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Speech\\ Voices\\Tokens\\ScanSoftTom_Dri20_22kHz"

As expected, the problem is that Calibre viewer's Read Aloud is lookng for a key that isn't there, and never was. Can I just delete that entry from the json to force Calibre to ask me to choose one?

I don't know whether it's safe to delete the whole "tts_sapi" entry but there's no reason why you couldn't change the entry to:

"tts_sapi": {},

i.e. remove the content between the curly brackets {}.