I've heard commentators numerous times talk about the fact that Scioscia calls the pitches during the game. But I admit I could be wrong
As far as Salt goes, he's one of those guys I really wanted to see work out and although I think it's a bit early to cut him off completely, I will say he can be frustrating to watch. And I can see why some people want to see a replacement.
Ex1, I was thinking the same thing about Tek. Maybe it would be best to let him call the game from the bench. At least try it out for a bit and see how it goes. Maybe taking that off Salty's plate may help him focus on the other aspects of his game.