How to pinpoint app repeatedly making Notification sound?

[FanOfNexus]

Nexus 7 2013, Android 4.4.4 (yes sorry have not updated)

Some app is making Notification sound. Have silenced apps that seem to have that option but still happening. If there's a way to finger the guilty party I'd much appreciate instructions.

Thanks

 

[belodion]

If it persists in Safe Mode, that will at least narrow it down to third-party apps.

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