I recently installed Mate to have something to switch back and forth too from the packaged KDE. Install went well, everything is in place I have set it up to how I like it with a theme and everything. The problem is the notification for when I mute, lower, or raise the volume is huge (and personally I never was much of a fan of it to begin with), I have been skimming through Dconf Editor trying to find a way to totally disable it and turning up nothing. (Perhaps I am missing it due to failure of knowing the actual name).

My question is can this be disabled? If not is there a theme folder or something to place custom images in to modify the old ones?