UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Steps to reproduce the problem:
1. Chrome notifications too loud.
2. 
3. 

What is the expected behavior?
I want to mute the notification sounds.

What went wrong?
Too loud notification sound.

Did this work before? N/A 

Chrome version: 69.0.3497.100  Channel: n/a
OS Version: OS X 10.13.6
Flash Version: 

I want to mute the notification sounds. in Chrome incoming email.