How do I fix the sound notifications?

i had installed Os 10.3.0.1052 and 10.3.0.1154 and 10.3.1.xxx
but all of them , the sound and notification are too low and some times i can't hear it

.....
so what should i do....

There isn't anything you can do to raise the sound except put the volume up all the way.
Make ringtones yourself that are louder using Audacity...a free program for your PC.

But that doesn't make sync
Why is that happening
But wen I return to Os 10.2.1.xxxx, it's work properly

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