Turning off sound associated with blacking the screen?

955450

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Mar 4, 2017
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The sound and notification settings on my 3a are confusing as all get-out to me.

I've had this phone for 10 days.

Just in the last couple days, it's started to make a tone, kind of like a hollow hoofbeat, when I use the side button to turn the screen off.

The noise itself isn't annoying - just the fact that the noise suddenly appeared, and I see no way to eliminate it?

How do I silence this noise? Is there an online manual with an expansive description of controlling all the combinations of notifications?