Could it be one of the > System Preferences... > Sound > Sound Effects > alert sounds? If so, you could have a bad key on your keyboard, which may cause the alert to play when it is pressed.
Yes, it was the basso sound. I pressed all the keys and some did honk - then didn't honk and others honked. My keyboard is fully charged. Do need another one?
I tried a different keyboard with the same results. Because my mouse was also acting strangely, I used the disk utility from the safe boot. It partially helped, so I downloaded ClamXAV and it seemed to clear up the situation. Perhaps, I had a virus. Thanks again. (*_*)
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