How can I disable/hide this automatic volume level pop over that appears when changing the sound level. Is there switch or secret flag to not show this when I change the volume using the volume keys on the keyboard (Macbook)?
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I found an answer here
Basically it is going to
You'll see there a lot of pdf-pictures, one of them
volume.pdf. You'll want to overwrite that one (backup the old one!) with an empty
mute.pdf, but I dont think that is necessary in movies.
When you open this PDF in Preview, you will see a white square, by default, Preview will show transparency as 'white'. As the illustration is white, and the transparency is white, you will see a white square instead of the white volume logo. You can turn the white transparency off. Go to View, Show Image Background (AltCommandB)