If any notifications should play sounds etc. via an addon the addon needs to check the "chat channel" where the message comes in.
There is a chat event which most addons use, providing the chat channel, and the text that is incoming/outgoing.
I'd ask the author of addons you have tested, and you like the most so far, to add support for CHAT_CHANNEL_SYSTEM messages so that you are able to define texts to listen and a sound to play for them as well.
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