Determine the source of a sound...

Hello,

My phone is constantly making a noise, similar to an alert sound when I receive a text, but not the same sound. This happens often and I can't determine the source of said sound. I am really wondering A) what the sound means and B) what is causing it. I've tried tracking battery usage and killing apps that might be producing the sound in the background but that process of elimination doesn't seem to be working.

Is there any method to identify what program might be pushing a sound out the phone speaker historically?

I'm on an HTC One M8, software version 4.25.651.18.
My phone is not rooted.

Please let me know if you can help .

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Determine the source of a sound...