So I am trying to find a device that is essentially a Y- splitter for a stereo audio signal where whenever a signal from one side of the the splitter comes on it overrides and mutes the other side Any help would be greatly appreciated. 
So I am trying to find a device that is essentially a Y- splitter for a stereo audio signal where whenever a signal from one side of the the splitter comes on it overrides and mutes the other side Any help would be greatly appreciated.