After deleting some answers leading up to this post my answer is found masked on mouse pointer hover.
The much upvoted question I found to be very interesting but needed to be researched before answer. My reply todate stands as the only reply.
After each improvement in the volume indicator updates with increased clarity is posted after deleting earlier one.. I may still improve it if possible.
Can anyone please help indicate what causes the masking?
Thanks for a clue.