Volume2
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Change volume rotating mouse wheel over Taskbar in Multiple monitors
I have used Volume2 byr rotating mouse wheel over taskbar to change the volume. I work with 3 monitors and when the application starts it works well in taskbar from any monitor. But always after sometime, somehow it doesnt work on my largest monitor. Then I have to close the application and start again.

Probably this clue can help you: https://github.com/irzyxa/Volume2/wiki/FAQ#5-stops-working-after-awhile