Edge's good sounding voices appear to be online only, and the locally installed ones are the ancient poor-sounding ones.

I noticed that the online ones sometimes translate numbers instead of just reading them; the Welsh one translates all numbers (I tried) into Welsh, the German one translates percentages into German but reads prices in English.

Anyway, if this is likely to be long-term permanent - https://www.youtube.com/watch?v=K3MYFT6VZk8 "Realtime text to speech with Plover" although it sounds awful.

(pet annoyance of mine, that all the best stuff (voices, recognition, image recognition, etc) these days seems to be cloud / mobile only and not desktop).