if you need to manage your notifications sounds this app is for you
in this app you can select different sound for each app or group them in one group and select one sound for the whole group
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Write Settings - set system notification sound to none (need to fully replace the sound of the notitifcation)
Notification Service - catch notifications to play the desirable sound
Q: why i can't hear any notification sounds?
A: you have to set the default notification sound at sound notification manage in the settings section
and have the notification service enabled at the accessibility settings
Q: why i can't hear any notification of specific app?
A: if this app has its own sound pick for its notification then this sound will be played insted the sound in the
to try to fix this you can set the sound in this app to the default sound .