Turn off notification sound

E.g. upon saving some changes there is a small notification message on the bottom right. I appreciate the message, but I would like to turn off the sound. Does anyone know where?

User check Mute Sounds

thanks for the reply, but I don’t know how or where to apply this

Go to User list, find your ID, open it; inside ‘MORE INFORMATION’ section you will find it ‘Mute Sounds’. Tick it, save the doctype and reload.

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By default, I get NO SOUNDS.

What setting to do to enable them?