What I meant to say was, the volume of the files for some of these units could use some readjusting to be on similar levels to those of other voices in the game. For instance, the American Spontooner is also shouting his lines, but it does not have the same jarring effect that some of the Italian units do because the volume of the Spontooner's lines is lower compared to say, the Italian Ranger, Pikeman, and Hussar, etc. I understand recording a new custom set of voices is quite a large task, to compensate I humbly suggest turning down the volume of these units' files by a small amount.
To expand on the problem I indicated that some units are too quiet: a clear example of this is the Greek Priest. Whereas the voices of virtually other Greek units are clear and at a normal volume, having originated from Age of Mythology, the custom voice given to the Priest is very quiet by comparison, and is somewhat inaudible.