Firewall Update sounds

Have upgraded from Comodo Firewall to CIS. Great! Love it!
It automatically updates at bootup. Great! Love it!
It DINGS with balloon popup twice, when it starts update and when it stops update.
I’m hard of hearing, so DINGS are loud. And annoying.
CIS is not in Sounds cpl, though Avast (removed prior to CIS install) still is.
Sound is Windows Default Beep (ding.wav), which I use and need for System apps.
Cannot for the life of me figure out how to turn CIS DINGS off.