Re: Silence fusion while using another self voicing program.
My memory is correct, but I also thought I'd point you to this webpage for ZoomText Fusion: https://www.zoomtext.com/fusion-info-en/
Look specifically for the section entitled: Switching from Full Speech to Speech On Demand or Mute
I also clearly remember that there is some way to have JAWS (or ZT-Fusion) automate the turning off of speech for you when you fire up another self-voicing program. I seem to recall something about using application profiles, but it's been ages and I don't have the full documentation handy. That's the way to go if you find yourself frequently firing up self-voicing programs and wanting JAWS/ZT-Fusion to be silent when they have focus.
Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.
~ H.L. Mencken, AKA The Sage of Baltimore