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No need for apologies on the style front. There were just kind of nitpickings ;)

I'm also working and trying on the observer pattern (GoF) to this very purpose. You can have a look at my experiments, as a stand-alone, kind-of sandbox code, here. I'm not making it through the official Qtractor CVS tree just yet because it's still in its early conceptual phase. There's too many things to think about before a proper integration. But you can have a try on it just for the fun :)

Seeya