Home Forums Mac Software Mac Operating Systems Sound output volume wont stay muted

Thanks guys, definitely not a Mail thing, though comes up in mail. Thump sound then when enter there, but in Facebook messenger that thump sounds when I use my app A text to trigger a expanded text..with any key.
Also right now in Chrome as click enter, but THUMP.

Hence global sounds nuincase. Long running Mag Torture bug; been free of it for few years and back with Catalina on desktop.

Sound, sound effects, play user interface sound effects, unchecked, system prefs. Out of ideas after that.