[@HypoSyringe]

Posted elsewhere, and because this applies to the original posters second (2nd, 2°) issue:

Microsoft Edge (Chromium): Speech Chat works well, and we really need a volume control for this utility.

+1 ...because it's 2021, and volume is an HTML 5 element.  Please let me know if you can use developer help.    ♥

HTML Audio/Video DOM volume Property (w3schools.com)

HTMLMediaElement.volume - Web APIs | MDN (mozilla.org)