Is it possible in ML to remove a popping message off of an application?

In GarageBand, every single time I plug/unplug my MIDI keyboard to my computer a message pop up: "The number of MIDI inputs has changed". Also, this attention whore icon won't stop jumping until I click on it. Is it possible to stop that? I change room many times during the day. This is really a daily annoyance.

Thank you guys.

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MacBook Pro (Retina, Mid 2012), OS X Mountain Lion