New features of Funtouch OS 15

Go to Settings > Shortcuts & accessibility > Accessibility > Open Sound notifications > turn on the switch.
Choose sounds to detect:
Tap settings icon at the upper right corner > Sound types > Choose the sound you’d like to detect.
Choose how you get notified:
Tap settings icon at the upper right corner > Ways to be notified , you can choose device to vibrate or the camera light to flash.
How to show Sound notification icon on the home screen:
Tap settings icon at the upper right corner > Turn on “Show icon in the app list”.

Это помогло?