FYI (anyone's information):
Classical sound engineers are wholly adept at reading full orchestral scores, and will, for example, be able to track minutia in a thick texture orchestral piece, i.e. hear and spot that the 3rd clarinet was off entry -- or some such, in any particular take.
They very often have a full classical training -- or a full equivalent -- and they possess highly acute, fast, and accurate hearing along with their engineering skills.
Basically, the job requires two very replete skill sets, which is why there are not a whole lot of them floating about in the marketplace.