O.P. RE: Want sound when message received
As I recall, the DMessengerEvents interface only reports /custom/ messages to plugins. In other words, it's a very limited resource, and a plugin using it will only be notified if it's relevant to that plugin. So, not much use to us.
However, you're right about Plus! being able to do it itself. If I had any contact with the authors of Plus!, I would ask them how it was done; but I don't know of any way other than hoping they read this post...
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