Mysterious random sound alerts

I'm running KDE 4.14.3 and for the last few days I've been getting frequent random sound alerts. I only get the sound without any popup message. I've examined all the settings in System Settings > Notifications, most of the notifications which play a sound are also configured to produce message popups and the few that play sounds only don't match the sound I hear.

I've checked files in /var/log for clues but there's nothing relevant there.

Could anyone suggest ways of tracking down the source of the sounds?
 
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