Comment 6 for bug 538761

The reason I'm doing that is it's already specified as something libnotify should support, so my patch is to implement that support.

Although, indeed, not trouble to use Canberra from the source. Come to think of it, now you've paused me for a moment, it would make more sense to not use the libnotify hint in this case. (Given the extra hacking that would be necessary and the thought that positional sounds would be darn cool for notifications except in this one case).
I'm just blindly obeying the all-knowing wiki :)

So, err, thanks and carry on!